Respuesta :
Answer:
A topic sentence states the main idea of the essay.
Explanation:
A topic sentence which is also referred as the focus sentence refers to a sentence that gives the summary of the main idea of an essay or paragraph. It is often used as the first sentence, but not in all cases as it may appear anywhere, in a paragraph or an essay.
The purpose of the topic sentence is to give insight or claim that lend a direct or indirect support to the essay. It is meant to ensure there is a cohesion in the essay and assist in organizing ideas of the entire essay.
Therefore, the correct option is that a topic sentence supplies the main idea of the essay.