Question

(15) our own american tradition of cereal as a breakfast food had an interesting evolution too. (16) factory life contributed to workers having less active lifestyles and caused people to experience morning indigestion. (17) due to the success of americas agricultural heartland, grains, especially wheat, were so plentiful that health advocates and entrepreneurs began to tout their healthful qualities. (18) fiber, in the form of whole grains, was recognized to aid digestion, and breakfast cereal was born. (19) the idea of eating cereal for health was being promoted by the late 1800s. (20) john kellogg and charles post promoted this idea. (21) we now recognize kellogg and post as two of the biggest names in breakfast cereal.
(22) kellogg and his brother manufactured two of the first breakfast cereals: cornflakes and granola. (23) post observed the kelloggs flaking process and created grape - nuts. (24) another figure in the happening of breakfast as we know it today was american dietary reformer, sylvester graham, who inspired the cracker of the same name. (25) he also recommended whole - grain cereal, exercise, fruits and vegetables, clean water, and fresh air. (26) then in the early nineteenth century, milk containing vitamin d solidified its place at the breakfast table as people began to learn about the importance of vitamins. (27) all of these changes shaped breakfast around the world.
(28) the long days of industrial work changed other meals as well. (29) with no more time for leisurely midday meals, quick and convenient foods became necessary. (30) lunch became the kind of quick meal that breakfast had been.
(31) the larger meal shifted to the evening when workers and schoolchildren returned home. (32) dinner was made up of meat, a starch, and a vegetable as people focused on the balanced diet. (33) dinners at the end of the day also took on greater importance because it became when the family spent time together.

1. what is the most effective way to combine sentences 19, 20, and 21?

the idea of eating cereal for breakfast was promoted by the late 1800s by john kellogg and charles post the two men we now recognize as big names in breakfast cereal.
although the idea of eating cereal for a healthy breakfast was being promoted in the late 1800s, john kellogg and charles post were recognized as two of the biggest names in cereal.
by the late 1800s, john kellogg and charles post, who we now recognize as two of the biggest names in breakfast cereal, promoted the idea of eating cereal for health.
the idea of eating healthy cereal was promoted by the late 1800s and john kellogg and charles post promoted this idea so we now recognize them as the two biggest names in breakfast cereal.

Explanation:

To combine sentences 19, 20, and 21 effectively, we need to maintain the logical flow and accurate information. Sentence 19 talks about the idea of eating cereal for health being promoted by the late 1800s. Sentence 20 says John Kellogg and Charles Post promoted this idea. Sentence 21 tells us we now recognize them as big names in breakfast cereal. The option "By the late 1800s, John Kellogg and Charles Post, who we now recognize as two of the biggest names in breakfast cereal, promoted the idea of eating cereal for health." combines these ideas correctly. It places the time ("by the late 1800s"), the people (Kellogg and Post) with their current recognition, and the action (promoted the idea) in a clear and concise way. The other options either have incorrect logical connections (like the "although" in the second option which doesn't fit the context) or awkward phrasing (like the first and fourth options).

Answer:

C. By the late 1800s, John Kellogg and Charles Post, who we now recognize as two of the biggest names in breakfast cereal, promoted the idea of eating cereal for health.