The hormone is produced in which some scientists speculate may lead to differences in male and female brain structure, and later variations in gender-related behavior(s).

I think the correct terms to fill in the blanks are androgen and males. The hormone androgen is produced in males, which some scientists speculate may lead to differences in male and female brain structure, and later variations in gender-related behaviors. It is a group of hormones that influences that development and the growth of the reproductive system of males. The most known hormone if this type id testosterone which is being produced by the testes. However, these substances are also found in women but only present in small amounts. Since too much of these hormones would lead to development of some male characteristics.

B. it promoted the powers of the executive branch