Final answer:
Calcium is necessary for proper muscle contraction, as it binds to troponin, initiating the contraction process. Potassium and Magnesium also support muscle function but aren't the primary minerals for contraction.
Step-by-step explanation:
The mineral necessary for proper muscle contraction is Calcium (B). Calcium plays a vital role in the muscle contraction process by binding to troponin, which leads to a series of steps that result in muscle contraction. Without adequate calcium, muscles would not be able to contract properly. It also has other important functions such as involvement in blood clotting and nerve function.
Other minerals like Potassium and Magnesium also support muscle function. Potassium is crucial for the proper functioning of the heart, muscles, kidneys, and nerves as it's a major cation inside cells. Magnesium is found in bones and within cells, playing a role in various systems, including muscles and the nervous system.