Your Brother Bob Is a Competitive Body Builder

Your brother Bob is a competitive body builder.His trainer suggested that he consume 4 egg white omelets per day.Bob remembers a warning about a possible vitamin deficiency from consuming too many egg whites and asks if he should follow the prescribed diet.Your reply to Bob is that he should not

A) be concerned as long as he consumes both the yolk and whites of the eggs.
B) follow the diet, since the avidin in the egg whites could bind to niacin and prevent its absorption.
C) follow the diet, since the avidin in the egg whites could bind to biotin and prevent its absorption.
D) be concerned, because, when the eggs are cooked, the avidin protein is denatured, and thus does not pose a problem for deficiency disease.