The answer is option D. Boycotts were used primarily by the civil rights movement in 1850s.
Boycotts was tactic that civil rights protester used during the civil right movement.
Boycott is simply the withdrawal from the usage of something as an act of protest. It is also the refusal to have any dealings with the party you are protesting against.
One of such boycotts in this movement was the Montgomery bus boycott. The black-Americans refused to use the bus because of the segregations that they faced in the bus.
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