The Fact That States Set a Minimum Age for Driving

The fact that states set a minimum age for driving automobiles and consuming alcohol illustrates that

A) state governments can discriminate in any way they see fit and only the federal government is required to treat everyone equally.
B) the equal protection clause of the Fourteenth Amendment does not actually require that government treat everyone equally.
C) the federal government is only able to prohibit discrimination on the basis of race and has no power to prohibit discrimination on the basis of other characteristics, such as age, gender, and physical disability.
D) the Tenth Amendment empowers state governments to nullify federal laws that they find inappropriate.