Final answer:
The major male sex hormone is Androgen option (B), primarily represented by testosterone, which is vital for the development of male secondary sex characteristics and sperm production.
Step-by-step explanation:
The major male sex hormone is B. Androgen. Androgens, which include testosterone and androsterone, are primarily responsible for the development of male secondary sex characteristics, such as the growth of facial hair, deepening of the voice, and increased muscle mass. Estrogens and progestins are more prevalent in females and contribute to the development of female secondary sex characteristics, such as breast development and the cycling of menstruation. Testosterone, notably, promotes the production of sperm and development of masculine characteristics.