Gabe's 85-year-old neighbor told him that when he was growing up, the milkman would deliver clear glass bottles of milk to his family's doorstep. He wonders why milk isn't available in clear glass bottles anymore. Gabe explains to him that light destroys ___ in milk, so milk is usually stored in opaque containers to help preserve the nutrient.
a) Riboflavin
b) Vitamin B-12
c) Thiamin
d) Niacin