Final answer:
The S-shaped portion of the large intestine, located in the lower left quadrants, is the sigmoid colon (d). Related to another aspect of the large intestine, the cecum is the section that attaches to the appendix (a).
Step-by-step explanation:
The S-shaped portion of the large intestine, located in the lower left quadrants, is the sigmoid colon. Hence, the correct answer to the question is d) sigmoid. This region of the large intestine begins after the descending colon and continues into the pelvis, where it becomes the rectum. The sigmoid colon is so named due to its S-like shape, and it plays an essential role in the final stages of digestion, moving waste towards the rectum.
With reference to the related question, the part of the large intestine that attaches to the appendix is the cecum, which is option a). The cecum is the beginning section of the large intestine into which the ileum of the small intestine empties.