Sutton Hoo is the ship burial. I am not sure about the others. I will try to figure it out though.
Answer:
C. Working to the point of exhaustion at least two times per week
Explanation:
Working out to the point of exhaustion may even discourage someone from their fitness plan. Although I'm not exactly sure what B means, everything else will help someone stick to a fitness plan.
Can you give me some context? What excerpt?