What is the best time to engage in team building activities?

A In the beginning of the project

B At the end of the project

C Throughout the project

D Some in the beginning and some in the end

Since the question asks for 'BEST' time, I think it is A, but the correct answer given is C.

From PMBoK: 'While team building is essential during initial stages of a project, it is a never-ending process'.