Answer:
C) abdomen
Step-by-step explanation:
The core muscle is a group of muscles present in the lower and middle back (abdomen) and in the area of the belly like rectus abdominis, multifidus and other muscles. The core muscles help in stabilizing and maintaining body movements and postures.
The core exercise is performed to strengthen the core muscles like side plank, push-ups, bicycle crunches which help maintain the proper balance, maintain posture, agility and prevent from the injuries.
Thus, C) abdomen is the correct answer.