Question

What is a way to protect your skeletal and muscular systems from injury?

A.
Lift heavy objects quickly.

B.
Avoid exercise.

C.
Carry at least 20 lbs. in your backpack at all times.

D.
Lift heavy objects with your knees bent.

Answer 1

D.
Lift heavy objects with your knees bent.

Answer 2

D is the answer , the rest don't make sense . Hope This helps !