Final answer:
The B vitamin destroyed by sunlight is Vitamin B2 (Riboflavin), although it is not listed among the given options. The question likely refers to B2 when discussing milk packaging to prevent light penetration. The water-soluble vitamin among the options given is Vitamin C.
Step-by-step explanation:
Milk packaging is designed to protect certain nutrients from sunlight. Specifically, some B vitamins are sensitive to light and can be degraded upon exposure. The correct answer to the question of which vitamin is destroyed by sunlight is Vitamin B2 (Riboflavin), although it is not listed among the options provided. Riboflavin is a B vitamin that is particularly sensitive to light and for this reason, it is essential to protect milk from sunlight to preserve its nutritional value. Among the options given (a) Vitamin B6, (b) Vitamin B12, (c) Vitamin D, and (d) Vitamin K, none are specifically known to be destroyed by light to a significant degree in a milk context.
As for the referenced question about water-soluble vitamins, the correct choice is Vitamin C (d), which is known to be water-soluble along with all the B vitamins. Fat-soluble vitamins include vitamins A, D, E, and K. Vitamin D is unique because it can be synthesized by the skin upon exposure to sunlight, a process that does not involve the protection from light that is required for vitamins like B2.