Question

the food pyramid, a familiar guide to nutrition, began as a swedish invention. the united states later adopted the concept. however, many of the initial scientific portion advisements were changed due to food industry concerns over profits. soon, the physical and financial costs of an unbalanced diet became a national concern. the u.s. food pyramid was criticized as inaccurate and outdated. a revised version was deemed difficult to interpret. harvard nutritionists took it upon themselves to create a new one. their version uses current science and clear wording to point people toward healthy choices.
ultimately, nutritionists the pyramid.
○ enforced
○ modified
○ marketed
○ cited

Explanation:

To solve this, we analyze the context: the food pyramid was criticized, a revised version was hard to interpret, and Harvard nutritionists created a new one. "Modified" means to change or alter, which fits as nutritionists changed the pyramid. "Enforced" (to make people follow) doesn't fit. "Marketed" (to promote) is irrelevant. "Cited" (to reference) also doesn't fit.

Answer:

B. modified