All of the Following Statements About Alliance Commitments Are True

All of the following statements about alliance commitments are true EXCEPT:

A) states have honored their alliance commitments in war most of the time.
B) it is difficult to know whether states would have gone to war even if there had been no alliance.
C) states' military situation can change,reducing the benefit of an alliance and therefore the states' dedication to the alliance.
D) states honor their alliance commitments,even when there is no world government to enforce these obligations.
E) states honor their alliance commitments because the cost of following through on their pledges is usually minimal.