Find the Values of the Variables for Which the Statement

Multiple Choice

Find the values of the variables for which the statement is true, if possible.
- $$\left[ \begin{array} { l l l } \mathrm { a } & - 1 & 6 \\1 & - 3 & \mathrm { f }\end{array} \right] + \left[ \begin{array} { r r r } - 2 & \mathrm {~b} & 7 \\\mathrm {~d} & - 7 & - 8\end{array} \right] = \left[ \begin{array} { l l l } - 6 & 4 & \mathrm { c } \\- 9 & \mathrm { e } & - 7\end{array} \right]$$

A) $a = - 4 ; b = 5 ; c = 13 ; d = - 10 ; e = - 10 ; f = 1$
B) $a = - 8 ; b = 3 ; c = 1 ; d = - 8 ; e = 4 ; f = - 15$
C) $a = 3 ; b = - 4 ; c = 24 ; d = - 9 ; e = 21 ; f = \frac { 7 } { 8 }$
D) $a = 4 ; b = - 5 ; c = - 1 ; d = 10 ; e = - 4 ; f = - 1$