Key Concept: Quiescence and diapause are both dormancy states, but they differ in cause and control.
Why it's correct: Quiescence is a temporary, environmentally-triggered halt in development — it starts and ends directly with unfavorable/favorable conditions, with no hormonal programming involved.
Why others fail: A genetically programmed dormancy describes diapause, not quiescence; increased metabolic activity is the opposite of dormancy; and the pupal stage is a fixed developmental phase, unrelated to environmental triggers.