The opening of the vagina is often covered partially by a membrane. W…

The correct answer is Option (4) → Hymen

The female external genitalia include the mons pubis, labia majora, labia minora, hymen and clitoris. The opening of the vagina is often covered partially by a membrane called the hymen. The labia majora and labia minora are folds of tissue around the vaginal opening, and the clitoris lies above the urethral opening.

NCERT Extract:
The Female Reproductive System – “… The female external genitalia include mons pubis, labia majora, labia minora, hymen and clitoris …. Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. The labia majora are fleshy folds of tissue, which extend down from the mons pubis and surround the vaginal opening. The labia minora are paired folds of tissue under the labia majora. The opening of the vagina is often covered partially by a membrane called hymen. The clitoris is a tiny finger-like structure which lies at the upper junction of the two labia minora above the urethral opening.”