Which sentence is TRUE? ___________.
选项：

A:The pursuit of only a singular, substantive goal often tends to support the choice of a competitive strategy.
B:Negotiators usually set clear objectives that can serve as standards for evaluating offers and packages.
C:If both substance and relationship outcomes are important, the negotiator should pursue a competitive strategy.
D:A competitive strategy would be appropriate when the relationship outcome is relatively more important to the strategized than the substantive outcome.