Hello!
In the question, it's asking you to figure out which piece of evidence from the text supports the main idea of the passage the best.
We know that the passage is talking about walking, so the topic of the paragraph is walking.
The main idea of the passage is that walking is not a very exciting form of exercise a person can do.
Now, since we know what the main idea of the passage, we can answer the question.
Answer: Walking is low impact, requires no fancy equipment, less likely to cause injury.
From all the answer choice, the last answer choice would be the correct answer because it is evidence that is adding on to the idea of walking being a not so exciting form of exercise. This evidence is showing that walking is boring, due to the fact that there is no fancy equipment needed, likeliness of injury is low, and is low impact.
I hope this helps you out
Good luck on your academics
-Jim