The correct answer is (c) Oxygen. Oxygen makes up about 65% of the human body by mass. It is the most abundant element in the Earth’s atmosphere, and it is essential for life. Oxygen is used in cellular respiration, which is the process by which cells convert food into energy.
Iron is the second most abundant element in the human body, making up about 4% of the body’s mass. It is a component of hemoglobin, which is the protein that carries oxygen in the blood. Iron is also found in myoglobin, which is the protein that stores oxygen in muscle cells.
Sodium is the third most abundant element in the human body, making up about 1.5% of the body’s mass. It is a major component of blood plasma and extracellular fluid. Sodium is also found in bones and teeth.
Iodine is a trace element that is essential for the production of thyroid hormones. Thyroid hormones are essential for growth and development, and they also regulate metabolism. Iodine is found in seafood, dairy products, and iodized salt.
In conclusion, the most abundant element found in the human body is oxygen. It makes up about 65% of the body’s mass, and it is essential for life.