Which of the following statements about a topic sentence and a main idea is accurate?
A. a topic sentence does not change position, but the main idea can be found in multiple places.
B. A topic sentence is found in the introduction, while a main idea is found in the conclusion.
C. A topic sentence and a main idea are always the same thing.
D. A topic sentence is the central idea of a paragraph, while a main idea is the central idea of an entire text.