SEP1/SEP2/SEP3/SEP4 quadruple mutants show:
All organs converted to leaf-like structures (C) is correct here. This is core ABCE & ABCDE MODEL +Synapdrgon flowering: once you know the definition or pathway step, All organs converted to leaf-like structures is the clear fit. The wrong ones are A) Only sepals; B) Only petals; D) Only carpels. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.