You have negotiated a major deliverable with a contractor several of your colleagues have utilized in the past without problems?

In my opinion D. Assumption -------------------------

Thanks for the invite.

Most appropriate among the given options is B - Goal .

C. Constraint...............

The choice is C.

The contractor perform according to WBS objective and so the choice is C.

Goal, constraints and assumptions are handled and controlled by the project management itself

Option (A) Objective -------------------------

Option-A, Objective.......................................................