Which vitamins are involved in the body's metabolism?

Vitamins that are closely associated with the body's metabolism encompass a range of B vitamins, which play critical roles in energy production and metabolic processes. Riboflavin (Vitamin B2), pantothenic acid (Vitamin B5), vitamin B6 (pyridoxine), and biotin (Vitamin B7) are directly involved in the conversion of macronutrients—carbohydrates, fats, and proteins—into energy.

Riboflavin is essential for the metabolism of fats, carbohydrates, and proteins, while pantothenic acid is a component of coenzyme A, vital for fatty acid metabolism. Vitamin B6 is important for amino acid metabolism and the production of neurotransmitters, and biotin plays a critical role in carboxylation reactions, which are crucial for metabolizing fats and carbohydrates.

In comparison, the other options list vitamins and minerals that, while important for various bodily functions, do not have the same direct role in metabolic processes as the B vitamins mentioned. For instance, vitamins A, D, E, and K primarily serve as antioxidants or contribute to other physiological functions but are not directly involved in metabolic pathways. Hence, option B correctly identifies the vitamins that are integral to the body's metabolism.