Without it we would not have blood pressure and it helps in building strong bones, transmitting nerve impulses, and making hormones; common sources include cocoa powder and wheat.

• A. Magnesium
• B. Potassium
• C. Sodium
• D. Calcium

Answer: (C)

Magnesium fits this description because it plays several key roles that tie directly to blood pressure, bones, nerve signaling, and hormone production. It helps regulate blood pressure by supporting proper smooth muscle function and vessel relaxation, and adequate magnesium is important for maintaining normal BP. In bones, magnesium is a structural component and helps manage calcium metabolism, contributing to bone strength rather than just calcium alone. For transmitting nerve impulses, magnesium acts as a crucial cofactor that stabilizes nerve cell membranes and controls ion flow, which underpins how signals are passed along nerves. It also supports the synthesis and function of various hormones, reflecting its widespread role in metabolism and endocrine activity. Foods like cocoa powder and wheat are rich sources of magnesium, which is why these items are often highlighted as common dietary providers. The combination of these roles and the noted dietary sources makes magnesium the best fit for the description.