The steroid hormone responsible for balance of water and electrolytes in our body is

The correct option is D Aldosterone
Insulin:

Insulin stimulates glycogenesis and cellular glucose uptake thereby decreasing blood glucose levels. Insulin is a peptide hormone.

Melatonin:

The level of melatonin increases during night and decreases during the day. It regulates the sleep wake cycle. It is a protein hormone.

Testosterone:

Testosterone regulates the development and maturation of male sex organs, muscle growth, spermatogenesis. Testosterone is steroidal in nature.

Aldosterone:

Aldosterone is a mineralocorticoid that is secreted when the level of sodium ions in the blood is low. It regulates the water and minerals concentration in the blood. It is a steroid hormone.

Final answer:

d. Aldosterone

Summary :

Aldosterone:
Aldosterone is a mineralocorticoid that is secreted when the level of sodium ions in the blood is low. It regulates the water and minerals concentration in the blood. It is a steroid hormone.

Final answer:

d. Aldosterone