2. How many of these four integers are prime?
$\begin{array}{llll}1 & 11 & 111 & 1111\end{array}$
A 0
B 1
C 2
D 3
E 4
2. B First note that 1 is not a prime. Of the other integers, 11 is prime; $111=3 \times 37$, so is not prime; $1111=11 \times 101$, so is not prime.