Which of the Following Is True of the Constitutional Roles

Which of the following is true of the constitutional roles of state and federal governments in regulating elections?

A) In the United States, elections for the presidency are purely national.
B) It seems to require only that states actually use and abide by elections.
C) The U.S.Constitution gives the federal government the leading role in regulating elections.
D) The federal government has no control over the regulation of national elections.
E) Senate elections are nationwide contests.