(a) oestrogen

(b) testosterone

(c) insulin

(d) growth hormone

Correct option – ( b )

Explanation for correct option – Testosterone is the male sex hormone produces in testes of males which promotes maleness. It helps in promoting spermatogenesis, the process of production of sperm. It also promotes secondary sexual characteristics in case of males.

explanation for incorrect options – oestrogen  hormones is found in females

insulin is related with blood glucose level

growth hormone regulates the growth

Hence the correct option is –  testosterone