The hormone which tones up the muscles of a person in the time of danger...

Explanation

The question is asking about the hormone that helps to strengthen the muscles of a person when they are in danger. The options are thyroid gland, pancreas, adrenal gland, and spleen. The correct answer is option C, which is the adrenal gland. The adrenal gland is a gland located above the kidney that secretes various hormones, including adrenaline. Adrenaline, also known as epinephrine, is a hormone that is released in response to stress or danger. When adrenaline is released, it increases heart rate and blood pressure, and it also causes the muscles to contract. This helps the body to prepare for a fight or flight response, which is the body's way of dealing with danger or stress. The thyroid gland, on the other hand, produces hormones that regulate metabolism. The pancreas produces insulin, which regulates blood sugar levels. The spleen is an organ that helps to filter blood and produces some immune cells. In summary, the correct answer to this question is option C, adrenal gland, because it secretes the hormone adrenaline, which helps to strengthen muscles during times of danger.