For What Value of a Is the Function $$f ( t ) = \left\{ \begin{array} { c } t - a , \quad - 10 < t \leq 3 \\t ^ { 2 } + 10 t , \quad 3 < t < 10\end{array} \right.$$

Multiple Choice

For what value of a is the function $$f ( t ) = \left\{ \begin{array} { c } t - a , \quad - 10 < t \leq 3 \\t ^ { 2 } + 10 t , \quad 3 < t < 10\end{array} \right.$$ continuous?

A) 10
B) -36
C) 30
D) -18