. . . . . . . . we do exercise, we will remain healthy.

A. Unless

B. If

C. When

D. More

Answer: Option B

Solution(By Examveda Team)

'if' is used in conditional sentences to introduce the circumstances in which an event or situation might happen, might be happening, or might have happened.
Example: She gets very upset if I exclude her.
You'll feel a lot better about yourself if you work on solutions to your upsetting situations.