Hello. You did not inform the film to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
We can see that the film is about the struggle of the black American population to gain access to civil rights. In order to improve their understanding of this topic, the film must present how the black population was violently harmed by white people who tried to prevent them from marching, protests and other claims for these rights. All this violence was not able to stop the black population, who were aware of their citizenship and rights and who were looking for a better and more just life not only for themselves, but for the blacks of the future.
The correct answer is elaborative rehearsal. Elaborative
rehearsal is being defined as a memory technique by which it is involved with
having to think about the meaning of a certain term that the individual
remembers by which it is opposed to simply repeating the word to one’s self
over and over again.