a-iv, b-i, c-ii, d-iii.

Explanation:

a. Oxytocin- (iv). Peptide

Oxytocin is a peptide hormone. Oxytocin is secreted by posterior pituitary gland and this hormone is responsible for secretion of milk from mammary gland.

b. Epinephrine- (i). Aminoacid derivative

Epinephrine is a amine hormone which is secreted by adrenal gland. This hormone is also known as emergency hormone which act during stress and emergency which increases the blood glucose level in body by increasing blood flow.

c. Progesterone- (ii). Steroid

Progesterone is a steroid hormone which is secreted by ovary. It is mainly female hormone which is responsible for pregnancy and is also known as pregnancy hormone.

d. Growth hormone- (iii). Protein

Growth hormone is a protein hormone which is secreted by hypothalamus which helps in regulating the body growth.