Step 1: State the theory.
The Frustration–Aggression hypothesis (Dollard, Doob, Miller, Mowrer & Sears, 1939) posits that frustration (blocked goal) creates a drive toward aggression.
Step 2: Differentiate distractors.
Bandura emphasized observational learning (Bobo doll) and reciprocal determinism; Freud proposed instinct theories (thanatos/eros) but not this specific hypothesis.
Step 3: Conclude.
\[
\boxed{\text{Dollard (Option A).}}
\]