The Supreme Court's Role in the Expansion of National Activity

The Supreme Court's role in the expansion of national activity after the Civil War is best characterized as

A) initial reluctance followed by promoting the nationalist perspective after 1937.
B) consistently supportive.
C) supportive, but only after Franklin Roosevelt raised the number of justices on the Supreme Court and packed it with supportive justices.
D) non-existent, given the difficulties the Court has in answering constitutional questions about federalism.
E) none of the above