Question

describe essay
persuasive essay outline
introduction
thesis statement:
lack of exercise is a problem because it causes heart disease, obesity,
and diabetes.
body paragraph 1
topic sentence:
first of all, lack of exercise is a problem because it can cause heart
disease.
body paragraph 2
topic sentence:
secondly,
and to obesity and weight gain.
body paragraph 3
conclusion
choose the correct answer
which should be used for the topic sentence of body
paragraph 3?
eating sugar can ruin your teeth by giving you lots of cavities.
thirdly, a lack of exercise can cause diabetes.
i get exercise from walking up and down the stairs of my apartment.

Explanation:

The essay outline focuses on the problems of lack of exercise (causing heart disease, obesity, weight gain). Body Paragraph 3's topic sentence should relate to another problem of lack of exercise. The option "Thirdly, a lack of exercise can cause diabetes" continues the theme of health issues from lack of exercise, fitting as a topic sentence for the third body paragraph. The first option is about sugar and teeth (unrelated to exercise), and the third is a personal example (not a topic sentence for the paragraph's main idea).

Answer:

B. Thirdly, a lack of exercise can cause diabetes.