According to ABCE model, sepals are specified by expression of:
Correct option is A, A + E. In ABCE & ABCDE MODEL +Synapdrgon flowering problems like this, the accurate statement is A + E; the others are common mix-ups. Not these: B) A + B + E; C) B + C + E; D) C + E. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.