Question

a vagina
b fundus of uterus
c uterine tube
d cervix

Explanation:

The cervix is the lower - narrow part of the uterus. In the female reproductive system diagram, the structure pointed to is the cervix. The vagina is the canal that leads from the external genitalia to the cervix. The fundus of the uterus is the upper - rounded part of the uterus. The uterine tube (fallopian tube) is the structure that connects the ovary to the uterus.

Answer:

D. cervix