Final answer:
The correct answer to the student's question is 'a) Cause and Effect,' as it describes a situation where Grampa Simpson's action of taking dance classes leads to the outcome of him impressing others with dance moves.
Step-by-step explanation:
The student's question is referring to a specific type of text organization found within English writing. The scenario described about Grampa Simpson attending swing dance classes and later impressing everyone at prom provides a situation and an outcome. This structure is known as cause and effect, which often answers the question "Why?" and helps readers understand the connections between an event and its outcome.
In this instance, the cause is Grampa Simpson signing up and attending swing dance classes, and the effect is the impressive dance moves he displayed two months later. Therefore, the correct answer is a) Cause and Effect.