The correct option is
E Parathyroid hormone
Homeostasis is the process wherein normal body variables are actively regulated inside a defined environment to remain very near to constant. The regulation of the concentration of sodium (Na+) and calcium (Ca++) ions in the blood, as well as glucose levels in blood plasma, are examples of Homeostasis. Each of the variables is controlled by a homeostat or regulator which are energy consuming physiological mechanisms of the body. The table given in the question shows the effect of a substance on the normal body variables after an intravenous injection of the same. According to the given data, since injection of substance B tends to increase the concentration of Ca++, it is a parathyroid hormone.
The plasma ionized calcium (Ca++) concentration is very tightly controlled by a pair of homeostats- the parathyroid glands and the parafollicular cells of the thyroid gland. Parathyroid hormone is secreted by the parathyroid glands in the case of a fall in the Ca++ levels.