The Supreme Court's 2013 Decision That Section 4 of the Voting

The Supreme Court's 2013 decision that Section 4 of the Voting Rights Act was unconstitutional means that

A) the federal government will have to act without Congress in order to ensure elections are fair and promote participation.
B) it's now up to citizens to challenge election laws that appear to discriminate against minorities.
C) state governments are now responsible for ensuring that elections are fair and promote participation.
D) the Voting Rights Act must be entirely rewritten and then passed by Congress before any of its provisions can again be in effect.
E) all future laws regulating elections and voter eligibility cannot be challenged in the courts.