AMC 8 2014 Problem 10

The first AMC $8$ was given in $1985$ and it has been given annually since that time. Samantha turned $12$ years old the year that she took the seventh AMC $8$. In what year was Samantha born? $\textbf{(A) }1979 \textbf{(B) }1980 \textbf{(C) }1981 \textbf{(D) }1982 \textbf{(E) }1983$