Question

Undocumented aliens are people who cross the border illegally or who _____.

A) stay past their time allowed for their visits
B) have infectious diseases
C) give up their citizenship in another country
D) do not speak English

Answer 1

A) stay past their time allowed for their visits

Their visa has expired, therefore saying they are not longer documented.

Answer 2

The answer is A. I actually know an undocumented alien. We talk a lot.