Final answer:
The cecum is the part of the large intestine that attaches to the appendix; the correct answer is 'a. cecum.'
Step-by-step explanation:
The part of the large intestine that attaches to the appendix is the cecum. The question presents multiple choices, and the correct answer is a. cecum. This is a straightforward question often covered in high school health or biology classes when discussing the human digestive system.