题目内容
（请给出正确答案）
[主观题]
According to the author, which of the following is not among the causes that lead to the f
ailure of some key oil-producing countries to boost their oil output capacity？
A．The US has imposed sanctions on Iran, Iraq, Sudan, Libya, and Burma (Myanmar).
B．The US at times helped both sides militarily in the 1980-88 war between Iran and Iraq.
C．The United States forced several oil-exporting nations to stop adding to their capacity to produce more oil.
D．The war between Iran and Iraq "drained the financial resources of the whole area."
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