Final answer:
The muscles contributing to Reid's abdomen look are the rectus abdominis, external oblique, and transverse abdominis; therefore, the answer is D. All of the above.
Step-by-step explanation:
The anterior abdominal muscles that give Reid this "look" include the rectus abdominis, external oblique, and transverse abdominis. The anterior abdominal wall is made up of these muscles which provide movement and support for the vertebral column as well as protection for the internal organs. Each of these muscles plays a distinct role:
- The rectus abdominis is the medial muscle extending the length of the trunk, contributing to the 'six-pack' appearance.
- The external oblique muscles are the superficial layer that extend inferiorly and medially, positioned on the sides of the rectus abdominis.
- The transverse abdominis is the deepest layer of muscle that wraps transversely around the abdomen, enhancing compression of the abdominal organs.
Considering all the information provided, the correct answer for which muscles contribute to Reid's abdominal appearance would be D. All of the above.