Which of the Following Voting Advantages Was Given to the Residents

Which of the following voting advantages was given to the residents of the District of Columbia?

A) Voters could ask volunteers to cast the vote on their behalf.
B) Voters could choose to mail-in their votes.
C) Voters could register up to or even on voting day.
D) Voters could choose to vote at a date convenient for them.
E) Voters are not required to register with local officials before voting.