What exercises should you perform if your goal is to improve flexibility of your chest and side muscles? a. hip flexor and side stretch b. shoulder stretch and chest and arm bends c. side stretch and chest and arm bends d. hamstring stretch and calf stretch (not a or b)

The answer would be: C. side stretch and chest and arm bends 

Side stretch should improve side muscles flexibility. Chest and arm bends should improve the chest flexibility. Hip flexor wouldn't affect the chest muscle and shoulder stretch wouldn't affect the side muscle.
Hamstring and calf is the muscle in lower extremity that wasn't near the chest or side muscle.

Is there any choices ?