ABA β‑D‑glucosyl ester is considered:
That points to B: Inactive storage form. Compared with the other options, Inactive storage form is the one that correctly describes the Phytohormone ALL concept. The wrong ones are A) Active ABA; C) Catabolic product; D) Signal molecule. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.