Hormones have the following features:
I. Adenohypophysis produces gonadotropins.
II. Besides sex cells, hormones are also produced by testis and ovary
III. Testosterone is produced by Leydig cells
IV. Estrogen is produced by the ovary
Which of the above factors influence secondary sexual characters?
 

Secondary sexual characters are influenced by GnRH of hypothalamus and gonadotropins (FSH and LH) produced by anterior pituitary gland in both males and females.

In males, androgens of testes and in females estrogen and progesterone from ovaries play a major role in the development of secondary sexual characters.