Which group of vitamins is primarily water soluble?

The group of vitamins that is primarily water soluble includes the B vitamins and vitamin C. Water-soluble vitamins are those that dissolve in water and are generally not stored in the body, which means they need to be consumed regularly in the diet.

The B vitamins encompass a variety of different vitamins that play crucial roles in energy production, red blood cell formation, and neurological functions, among others. Vitamin C is vital for collagen synthesis, immune function, and acts as an antioxidant. Since these vitamins are water soluble, any excess amounts consumed are excreted through urine rather than stored in the body, which highlights their need for regular intake.

In contrast, the other options listed, such as vitamin A, vitamin D, and vitamin K, are fat-soluble vitamins. These vitamins are absorbed along with dietary fat and can be stored in the body's fatty tissues and liver, leading to different implications for deficiency and toxicity compared to their water-soluble counterparts.