If $\begin{tabular}{r|l}a&b \\ \hline c&d\end{tabular} = \text{a}\cdot \text{d} - \text{b}\cdot \text{c}$, what is the value of $\begin{tabular}{r|l}3&4 \\ \hline 1&2\end{tabular}$?
$\text{(A)}\ -2 \qquad \text{(B)}\ -1 \qquad \text{(C)}\ 0 \qquad \text{(D)}\ 1 \qquad \text{(E)}\ 2$
Plugging in values for $a$, $b$, $c$, and $d$, we get
$a=3$, 
$b=4$, 
$c=1$, 
$d=2$, 
$a\times d=3\times2=6$
$b\times c=4\times1=4$
$6-4=2$
$\boxed{E}$