The US senior officials were involved in the Iran-Contra affair for the purpose of prevention of Iran falling under the control of the Soviet Union.
The Iran-contra Affair took place after the end of the World War II, when there was a separation between the US and the Soviet Union because of communism.
To control the Iran by losing control over the communist government of the Soviet Union, the senior officials of the United States interfered in the Iran-Contra Affair.
Hence, option B holds true regarding the involvement of the United States in the Iran-Contra Affair.
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