The "One Person, One Vote" Rule That Emerged from the Supreme

The "one person, one vote" rule that emerged from the Supreme Court's decision in Wesberry v. Sanders (1964) means that

A) everyone has the right to cast one vote in presidential elections.
B) all votes will be counted.
C) congressional districts must have equal populations so that one person's vote counts as much as another's vote.
D) voters must cast one vote for president and one vote for vice president.
E) the number of electoral votes each state has will be determined by each state's population.