Final answer:
The main stabilizer of upper body exercise is the core muscles, which includes abdominal muscles, lower back muscles, and obliques. So, correct option is (c).
Step-by-step explanation:
The main stabilizer of any upper body exercise is the core muscles. This group of muscles is essential for maintaining proper posture and balance throughout various exercises. They support the trunk and allow the body to generate power and stability for both upper and lower body movements. The core muscles include the abdominal muscles, the muscles of the lower back, and the obliques among others.
While the pectoralis major and latissimus dorsi are indeed important muscles for movements like humerus flexion, extension, and adduction, they are not the main stabilizers for upper body exercises. The gluteus maximus also plays a significant role in lower body exercises and stabilization, but not primarily in upper body stabilization.
The core muscles, which include the rectus abdominis, obliques, and transverse abdominis, help in maintaining stability and proper posture during upper body movements. They provide a stable base for the arms and shoulders to perform exercises, such as push-ups, bench press, and shoulder press.