Why Must Federal Legislation That Affects Business Be Based on an Expressed

Why must federal legislation that affects business be based on an expressed constitutional grant of authority?

A) Because the U.S. Congress passed a law to that effect.
B) Because the federal government has only those powers granted to it by the Constitution.
C) Because the President Lincoln issued an executive order to that effect.
D) Because President Washington issued an executive order to that effect.
E) Because it is a custom.