Answer:
A. refusing to sell oil to the United States.
Step-by-step 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.