Using the Bell Curve Below,answer the Questions That Follow $\begin{array}{|c|}\hlineb.\\\downarrow\\\hline\end{array}$ $\begin{array}{|c|}\hlinea.\\\downarrow\\\hline\end{array}$

Using the bell curve below,answer the questions that follow.
$\begin{array}{|c|}\hlineb.\\\downarrow\\\hline\end{array}$ $\begin{array}{|c|}\hlinea.\\\downarrow\\\hline\end{array}$
-Point a on the normal distribution represents the IQ cut-off score for which disability category?

A) Learning disability
B) Gifted
C) Mental retardation
D) Autism