The substance that is under consumed in the United States is potassium. The correct option is A.
What is potassium?
Potassium is a mineral that helps in maintaining the blood pressure and balancing of nutrition is the body.
It is present in bananas, grapefruits, cantaloupe, etc. Maintaining a good level of potassium is essential for heart and strength of muscles.
Thus, the correct option is A. potassium.
Learn more about potassium
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