You have eight people in your project, and one more person will be joining next week. Once the new person joins, the number of communication channels will increase by:

(A) 0
(B) 8
(C) 12
(D) 20

I post this question because if i add myself (PM) to the project team, i cannot get the answer.
How to determine the question have to add myself (the PM) to the team size or not?