Answer:
c) human growth hormone
Step-by-step explanation:
Human growth hormone (GH) is a peptide hormone that stimulates growth, cell reproduction, and cell regeneration in humans. The effects of this hormone on the tissues of the body is anabolic (helps to building up tissues). So it seems reasonable that a decreasing in GH leads to age-related loss of muscle.
The secretion of GH is maximal at puberty, then it have a gradual decline during adulthood. Indeed, circulating GH levels decline progressively after 30 years of age at a rate of ~1% per year. There is evidence that this decline in GH levels contributes to the loss of muscle tissue, adults with deficiency in this hormone tend to have a relative increase in fat mass and a relative decrease in muscle mass.
THe other options have other functions different to stimulate growth. For example thyroxine regulate metabolic rate, hearth and digestive function. Estrogen is related with development of the female reproductive system. Aldosterone regulate salt and water in the body having great effect in blood pressure. And cortisol increases sugar level in the blood.