Some sneakers have canvas tops. The paragraph explains that this is one kind of sneaker. This sentence instead tells about a kind of shoe. Some sneakers are sold in many stores. Some people wear sneakers instead of shoes.
Some sneakers reflect light for night jogging.
Answers A and B do not tell about a kind of sneaker, which is the paragraph topic. Sometimes the main idea of a paragraph or story is not directly stated in one sentence. However, the reader can still decide what the paragraph is mainly about. Read the following paragraph to find its main idea. Much damage can be caused by floods.