Of the Following Individuals, Who Has the Fewest Number of Barriers

Of the following individuals, who has the fewest number of barriers to taking ESL courses and successfully learning English?

A) Amy, a 35-year-old mother of three who works two part-time jobs and who has been in the US for six months
B) Barbara, an 85-year-old widow who can no longer drive and who has lived in the US for twelve years
C) Charlie, a 50-year-old single man who works at a factory in a rural town
D) David, a 12-year-old who came to the US three months ago as an exchange student