Which of the Following Statements Comparing Animal and Plant Protein

Which of the following statements comparing animal and plant protein is INCORRECT?

A) All natural, unprocessed animal and plant foods contain all twenty amino acids
B) Animal protein is considered to be a complete or high-quality protein
C) Proteins usually exist in smaller concentrations in plant foods, thus the quality of amino acids found
In plants is inferior to those obtained from animals
D) Most plant proteins have insufficient amounts of one or more of the essential amino acids