The United States got into a conflict with Iran over oil in 1973 because the United States wanted to show its opposition to the ruling party in Iran. That is option C.
The Oil conflict between Iran and United States started in October 1973 and lasted till march 1974.
The conflict occurred because the United States made the decision to re-supply the Israeli military and to gain leverage in the post-war peace negotiations.
This very act by the United States showed their opposition to the ruling party in Iran.
Therefore, the United States got into a conflict with Iran over oil in 1973 because the United States wanted to show its opposition to the ruling party in Iran.
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