A colon can be used to combine two clauses when you use it to represent the word

A. then.

B. because.

C. and.

D. however.

The question is asking to choose among the following choices that the Colon would represent that can be use to combine two clauses and base on my research, I would say that the answer would be letter C. and. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications