To improve <span>cardiorespiratory fitness a person should participate in aerobic exersises of moderate intensity for approx. 30 minutes threeto four times a week</span>
<span>He it was who fought his way through the white water</span>
Answer: B
Explanation:The dash is used more effectively and in the first and last one they don't make sense. In A), it would have made sense if it didn't include the info about the house in town.
I would say the 2nd to last paragraph the on that starts with "He"