Which of the following is a known antioxidant that scavenges toxic O2 species?

Vitamin C, also known as ascorbic acid, is well recognized for its role as a potent antioxidant in the body. It acts by scavenging reactive oxygen species (ROS), which are harmful byproducts of cellular metabolism that can cause oxidative stress and damage to cells. By neutralizing these toxic species, Vitamin C helps to protect cellular structures, including lipids, proteins, and DNA, thereby playing a crucial role in maintaining overall cellular health.

In addition, Vitamin C is involved in the regeneration of other antioxidants, such as Vitamin E, further enhancing its protective capabilities. Furthermore, it contributes to various physiological functions including collagen synthesis and immune response.

The other vitamins listed, while important for various physiological functions, do not primarily serve the role of scavenging toxic oxygen species in the same way that Vitamin C does. Vitamin D is mainly involved in calcium metabolism and bone health, Vitamin A plays crucial roles in vision and immune function, and Vitamin K is essential for blood clotting processes.