Capacitation occurs in

The correct option is D

female reproductive tract

The correct option is D.

Explanation of the correct option:

1. Capacitation is the sperm activation process in mammals that occurs in the female reproductive tract.
2. In the female reproductive tract, some secretion destabilizes the acrosomal part and activates sperm to penetrate the egg and fertilize the ovum.

Explanation of the incorrect option:

Option A:

1. Vas deferens is the male reproductive structure that originates from the epididymis.
2. Vas deferens carry sperms.

Option B:

1. The epididymis is a long narrow closely coiled tubule that lies along the inner side of each testis of the male reproductive part.
2. It stores sperms and secretes a fluid that nourishes sperms.

Option C:

1. The Rete testes is a small tube in the testicles.
2. It helps move sperm cells from the testis to the epididymis.

Final answer: Capacitation occurs in the female reproductive tract.