Your project team members need to know, in very specific terms, what work needs to be completed on the project?

C. The project statement of work it's very vital

c. The project statement of work

Points C will give clear flow of action needed.

I am agree with mr Farook.

I agree with Mhd Farooq. Always follow the PMBOK when in doubt. Answer is C.

My answer is B. Well, product scope is the scope of the final output, the scope of the actual deliverable, and the rest of the choices are actually the ones that the development team will constantly check, right? 

important work needs first attention

The Project statement of work is sufficient to get understand about the scope.

So my Answer is C

Yes in order to full fill and give quality service the whole team needs know what needs to be done. In what order it needs to be done.

Will explain the needs to know and educate him till he understands clearly of the project and work.

Answer is (A) wbs (WORK BREAKDOWN STRUCTER) AND LET THEM DO