Question

Swimming alone

A. is acceptable in a pool but never in a lake or an ocean.
B. increases the benefits of swimming for cardiorespiratory endurance.
C. is never safe, regardless of ability.
D. is OK as long as you've been swimming for at least five years.

Answer 1

I think C because if something happens you might drown and no one to help you. but that's just a guess

Answer 2

C. is never safe, regardless of ability.