Correct option is B
Inside the embryo sac, the synergids have special cellular thickenings at the micropylar tip that is called the filiform apparatus that play an important role in guiding the pollen tube into the synergid. Tapetum is one of the wall layer of the microsporangium that nourishes the developing pollen grains. Exine is the outer layer of the pollen grain, it is hard and is made of sporopollenin that cannot be degraded by any enzyme. Funicle is a stalk like structure that attaches the ovule to the placenta.
