Reduction division occurs in the megaspore mother cells. Egg has a filiform apparatus. A small central cell is present in the embryo sac. There are numerous antipodal cells.

Megaspore mother cell of megasporangium undergoes meiosis and forms megaspore tetrad, out of which, one megaspore is functional. The central cell of the embryo sac is a large cell consisting of two polar nuclei. Two synergids, the flanking cells of the egg cell, have finger-like projections of the wall in their cytoplasm, the filiform apparatus. An embryo sac has three antipodal cells which provide nutrition to developing the embryo. Therefore, the correct answer is option A.