Dephosphorylation of BIN2 is mediated by:
That points to B: BSU1. Compared with the other options, BSU1 is the one that correctly describes the Brassinosteriod concept. The wrong ones are A) PP2A; C) CDG1; D) BAK1. 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.