The correct option is D a-iii, b-iv, c-i, d-ii
Mons pubis is an inverted triangular protruding mass of fatty tissue over the pubic bone in human females. The antrum is the portion of the Graafian follicle that is filled with follicular fluid. The trophoectoderm cells, on the outer edge of the blastocyst, are the first to differentiate from a fertilized egg and further help in embryo development. Nebenkern is derived from the mitochondria and is a two-stranded helical structure in the proximal end of the tail region of a sperm. Hence the correct answer is 'a-iii, b-iv, c-i, d-ii'.