One Advantage of Team Production Over Contracting Out Is That

One advantage of team production over contracting out is that

A) the cost of negotiating and enforcing contracts is generally lower with team production than with contracting out.
B) the principal agent problem is eliminated by team production but cannot be addressed in contracting out.
C) costs are always lower with team production because of the elimination of transactions costs.
D) efficiency is always greater with team production.