The Frustration-Aggression Hypothesis Asserted That Frustration Inevitably Leads to Aggression

The frustration-aggression hypothesis asserted that frustration inevitably leads to aggression and all aggression is the result of frustration. Subsequent research has revealed that:

A) only the assertion that frustration inevitably leads to aggression has received considerable empirical support.
B) both of these assertions are strongly supported by empirical evidence.
C) neither of these assertions is supported by empirical evidence.
D) only the assertion that all aggression is the result of frustration has received considerable empirical support.