Answer:
Option B
Step-by-step explanation:
The muscles around your heart consist of "cardiac muscles" or option B. Cardiac itself means heart or involving the heart, and cardiac muscles is one of the main components or tissue that surrounds your heart. It's not option A because skeletal muscles are the muscles that cover your bones, it's not option C because smooth muscles are only involved with digestion and gaining nutrients for your body. Which leaves option D and strong muscles isn't the answer because strong muscles is the amount of force a person can put out or strength.
Hope this helps.