Act III considered the climax of Julius Caesar because this is where all of Brutus' conflict is resolved as well as because, it is where Brutus makes the decision to terminate Caesar. (Option A)
The climax, or crisis, in the structure of a play is the crucial moment, or turning point, at which the increasing action of the play is reversed to falling movement.
It may or may not correspond with the drama's main point of interest.
From the foregoing therefore, the correct option is option A.
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