Riboflavin Is Similar to Thiamin in That _____

Riboflavin is similar to thiamin in that _____.

A)  both are found in abundant amounts in pork. 
B)  both serve as coenzymes in energy metabolism. 
C)  both are easily destroyed by heat. 
D)  both are easily destroyed by ultraviolet light. 
E)  though rare, both can be toxic when consumed in high amounts.