Explanation:

- Option 3: Ovary

- The ovaries are the primary sex organs in females.

- They produce eggs (ova) and hormones like estrogen and progesterone.

- Option 1: Uterus

- The uterus is a secondary reproductive organ.

- It is where a fertilized egg implants and grows during pregnancy.

- Option 2: Fallopian tube

- These tubes transport eggs from the ovaries to the uterus.

- They are the usual site for fertilization.

- Option 4: Vagina

- The vagina is the canal leading from the cervix to the outside of the body.

- It acts as a passageway for childbirth and menstrual flow.