2.24Integrative negotiation fails because
选项：

A:A) negotiators fail to perceive the integrative potential of the negotiating problem.
B:B) of distributive assumptions about the negotiation problem.
C:C) of the mixed-motive nature of the issues.
D:D) of the negotiator's previous relationship with one another.
E:E) All of the above are reasons why integrative negotiations fail.