Passage of legislation in congress requires mutual accommodations. this suggests that congressional behavior is

I think this question showed up here twice on .  I'll refer you to the answer I gave at the other location:
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Basically, the concept the question is referencing is the principle of reciprocity. The principle of reciprocity says that human beings have a need and tendency to want to give something back when something is received.  This give and take approach helps us to work together toward compromises and mutually agreeable solutions.

Ais your correct answer