The FT–FD complex activates genes related to:
That points to B: Floral meristem identity. Compared with the other options, Floral meristem identity is the one that correctly describes the PSS-Sec-E-Sensory biology concept. The wrong ones are A) Root development; C) Leaf senescence; D) Phototropism. 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.