Vernalization-induced flowering response is generally:
Pick C: Stable but can be reversed by heat. Thinking through VERNALIZATION & FLOWERING step by step rules out the lookalikes and leaves Stable but can be reversed by heat. Skip these: A) Reversible permanently; B) Temporary only; D) Dependent only on photoperiod. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.