B is not a concern because even if the unlisted number belongs to rich, powerful, or famous people, it's still 1 person 1 vote. backgrounds like those don't matter
A IS a concern because there is an age restriction .
before the vietnam War, age was 21
"if they can take a bullet they can take a ballot"
E is a concern because sampling is a way to give the projected winner until all.votes are counted. so if too many non voters are sampled cant accurately projwct the winner