Phloem unloading at sink tissues is generally:
That points to B: Energy dependent. Compared with the other options, Energy dependent is the one that correctly describes the PHLOEM TRANSLOCATION concept. The wrong ones are A) Passive only; C) Always diffusion driven; D) Independent of metabolism. 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.