When Nixon refused to withdraw support of Israel, OPEC responded by:
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A. refusing to sell oil to the United States.
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B. increasing the trade of oil with the United States.
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c. seeking the intervention of the Soviet Union.
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D. giving in to American demands.

A. refusing to sell oil to the United States.

Explanation:

Members of the OPEC are among the largest oil producer in the world. Most of them have a large Muslim population that is very unlikely to support Israel during the conflict.

When Nixon refused to withdraw support of Israel, OPEC decided to put an embargo for oil products that they sell to United States. This led to the 1973 oil crisis.

Since US purchased large portion of their oil from OPEC , This caused a massive scarcity of Oil In united states. The price of oil in United States was quadrupled due to this scarcity.

increase in population