Which Statement Characterizes the Protein Nutrition in Vegetarians

Which statement characterizes the protein nutrition in vegetarians?

A) Vegetarians in general must practice complementary protein nutrition.
B) Most vegetarians should consume gelatin to ensure adequate tryptophan intake.
C) Healthy vegetarians typically consume protein sources of very high digestibility.
D) Most vegetarians eating a variety of foods need not balance essential amino acid intake at each meal.
E) A significant majority of vegetarians experience clinically significant protein malnutrition.