A Part of the World's Population That Does Not Have

A part of the world's population that does not have the luxury of choosing an assortment of food subsists on vegetarian diets because _____.​

A) ​meat and other animal products are scarce or too expensive
B) of a desire to preserve the environment
C) of a desire to gain weight
D) of political reasons
E) ​of a desire to lower the risk of developing a particular condition