State Laws That Restrict the Right to Vote to People

State laws that restrict the right to vote to people over the age of 18 are an example of

A) a permissible basis for discrimination under the Supreme Court's standards of classification.
B) an arbitrary classification under the Supreme Court's standards of classification.
C) an inherently suspect classification under the Supreme Court's standards of classification.
D) an intermediate classification under the Supreme Court's standards of classification.
E) None of these is true.