The policy that was reflected in President Kennedy's phrase was A)brinkmanship.
Brinkmanship refers to a practice where a dangerous policy is pursued up to the point where full conflict could break out before stopping.
Kennedy used this in the phrase, "a full retaliatory response" to warn the Soviets that he was not going to back down from conflict and would pursue his policy till the end.
In conclusion, option A is correct.
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