The correct answer is estrogen hormone.
It is estrogen hormone which brings about changes in the body of a female during puberty and causes the growth and development within her body. Puberty is a period in the life span of a female which ranges from 12 to 19 years in a female. The changes which occur in a female body during puberty are breast enhancement, growth of pubic hair and widening of hips. These characters and changes during puberty are also known as secondary sexual characters. During this period, a female proceeds towards attainment of adulthood and becomes capable of reproduction. All this occurs under the influence of estrogen hormone.