The correct answer is (b), potassium. Potassium is a mineral that is essential for the proper functioning of the heart. It helps to regulate the heartbeat and blood pressure. Potassium is also important for muscle contraction and nerve function.
Sodium is also a mineral that is important for the body, but it does not play a role in heart function. Sodium helps to regulate blood pressure, but it can also increase the risk of heart disease if consumed in excess.
Iron is a mineral that is essential for the production of red blood cells. Red blood cells carry oxygen to the body’s tissues, including the heart. However, iron does not play a direct role in heart function.
Sulphur is an element that is found in proteins and other molecules in the body. It does not play a direct role in heart function.
In conclusion, the correct answer to the question “Which of the following minerals is necessary to control heart beat?” is (b), potassium.