Concept:Female sex hormones are primarily produced by the ovaries and regulate reproductive development and functions.Explanation:Estrogen is the main female sex hormone. It is mostly produced by the ovaries. It controls puberty, menstrual cycle, and secondary sexual characteristics like breast development. Progesterone is another female sex hormone that supports pregnancy. Androgen and testosterone are male sex hormones. Insulin regulates blood sugar. Oxytocin is involved in childbirth and bonding. Among the options, only estrogen is a primary female sex hormone.Answer:A. estrogen