Estradiol hormone is responsible for:

The correct answer is Option (3) → Secondary female characteristics

Estradiol is a steroid hormone made in the ovaries; it is the main female sex hormone.

NCERT (2026-27 edition):
Hormones – “… Testosterone is the major sex hormone produced in males. It is responsible for development of secondary male characteristics (deep voice, facial hair, general physical constitution) and estradiol is the main female sex hormone. It is responsible for development of secondary female characteristics and participates in the control of menstrual cycle. Progesterone is responsible for preparing the uterus for implantation of fertilised egg.”