Match the columns.

Column $I$	Column $II$
$(a)$ Mons pubis	$(1)$ Embryo development
$(b)$ Antrum	$(2)$ Sperm cell
$(c)$ Trophoblast layer	$(3)$ External genitals of female
$(d)$ Mitochondria	$(4)$ Graafian follicle

(A) $(a - 3), (b - 4), (c - 1), (d - 2)$
Explanation:
- Mons pubis is a cushion of fatty tissue covered by skin and pubic hair,which is part of the external female genitalia.
- Antrum is the fluid-filled cavity present in the Graafian follicle.
- Trophoblast is the outer layer of the blastocyst that attaches to the endometrium and is involved in embryo development and placenta formation.
- Mitochondria are present in the middle piece of the sperm cell to provide energy for motility.