Final answer:
The first of the three sections of the colon is the sigmoid colon, which is a C-shaped segment about nine inches long that connects to the rectum.
Step-by-step explanation:
The first of three sections of the colon is the C shaped segment called the sigmoid colon. It is approximately nine inches long and is the part of the colon that connects to the rectum. The sigmoid colon plays a crucial role in the digestion process by holding the fecal matter until it moves to the rectum to be expelled. The large intestine includes several parts: the ascending colon, transverse colon, descending colon, and the sigmoid colon, which then connects to the rectum.