The correct answer is A.) Analyze the differences between yoga and aerobics, and then explain which one is better for your body.
Step-by-step explanation:
Explanatory texts focus on explaining or providing information to make clear a topic, process, or event. This form of writing is used in encyclopedias and similar that explain readers a topic. In this context, the prompt that requires an explanatory text and an explanatory thesis (position of the author) is option A as the section "and then explain which one is better for your body" shows the writer will need to explain or provide information to help the reader understand why yoga or aerobics are better, which might include providing information about health, psychological benefits, etc.