A deficiency of which vitamin can negatively impact the synthesis of protein throughout the body?

Vitamin B6 plays a crucial role in the synthesis of proteins due to its involvement in amino acid metabolism. It acts as a coenzyme in reactions that convert amino acids into proteins and is essential for the proper functioning of enzymes that facilitate these processes. A deficiency in vitamin B6 can lead to impaired protein metabolism, resulting in various health issues such as weakened immune function, skin disorders, and overall diminished physiological performance because proteins are vital for numerous bodily functions, including tissue repair and the production of hormones and enzymes.

While vitamin B12 and vitamin C are also important for overall health, they have different primary roles. Vitamin B12 is primarily involved in red blood cell formation and neurological function, whereas vitamin C is crucial for collagen synthesis and antioxidant protection. Vitamin D, on the other hand, mainly regulates calcium and phosphate metabolism and is not directly related to protein synthesis. Thus, the significance of vitamin B6 in protein synthesis makes it the correct answer.