It is believed that it is more important for those who are worn with age to take part in exercise.

A、它被相信更重要的事就是让年老体衰的人参加锻炼。

B、据信年老体衰的老年人参加锻炼更为重要。

C、据信通过参加锻炼来防止年老体衰是更重要的。