The correct option is A embryo sac
In angiosperms, the female gametophyte is called embryo sac. Embryo sac is an oval multicellular haploid structure which is embedded in the nucellus towards micropylar half of the ovule. It is covered over by a thin membrane derived from the parent megaspore wall. It contains 8 nuclei and 7 cells. In these 7 cells 3 are toward micropylar end called as egg apparatus, 3 towards chalazal are antipodals and one central cell.