Why Did the Combination of Corn and Beans Prove So

Multiple Choice

Why did the combination of corn and beans prove so crucial to the diet of early Americans?

A) Corn remedied the digestive issues that beans created.
B) Beans neutralized an otherwise toxic compound in Archaic forms of corn.
C) The beans added amino acid to the corn, making the combination as nutritious as meat.
D) Corn and beans grew under different conditions and in different places, making harvests more reliable.