Final answer:
The frustration-aggression hypothesis is best represented by the scenario where someone becomes aggressive after finding their plan to eat disrupted by moldy leftovers (Option B), fitting the theory's premise that blocked goals lead to aggression.
Step-by-step explanation:
The frustration-aggression hypothesis is best illustrated by the scenario where an individual's important goal is thwarted, leading to aggressive behavior. This hypothesis suggests that aggression is often a result of frustration when a person is impeded from achieving a goal. In the context of the examples provided, the best illustration of this theory is when someone is feeling hungry and decides to eat leftovers, only to find that they are moldy and inedible due to someone else's actions, thereby leading to yelling at the sister. This reaction to frustration fits the hypothesis as the goal of satisfying hunger is blocked, resulting in an aggressive response.