The answer is b. I am not sure exactly how to explain this, but it fits in much better with that question. I hope this could help you!
Upper epidermis. The cuticle on upper epidrrmal layer prevents excessive water loss
Answer:
An embryo sac is said to form when the haploid megaspore nucleus divides. It possesses two haploid nuclei and six haploid cells which do not have cell walls.
Explanation: