Final answer:
The pectoralis major muscle is located in the chest region of the body; also referred to as pectorals. It is involved in various movements of the upper limb (Option C).
Step-by-step explanation:
The pectoralis major muscle is part of the body's muscular system, specifically related to the movements of the upper limb.
This thick, fan-shaped muscle covers much of the superior portion of the anterior thorax and is involved in various actions involving the humerus, the bone of the upper arm.
Answering your question, the pectoralis major muscle is located in the chest region of the body.
Therefore, the correct answer to your question is: Chest (Option C).