Many People Are Concerned About the Use of Mail-In Ballots

Many people are concerned about the use of mail-in ballots because

A) they fear no one will mail back their ballot.
B) candidates can change and voters can move within days of an election.
C) they fear that mailing ballots opens up a range of opportunities for voter fraud.
D) it drastically increases the cost of election administration.
E) election results in a mail-in state will be known much more quickly than in other states.