Perform the Indicated Operation $5 \mathrm { i } + ( - 6 - \mathrm { i } )$

Multiple Choice

Perform the indicated operation. Write the result in the form a + bi.
- $5 \mathrm { i } + ( - 6 - \mathrm { i } )$

A) $- 6 + 4 i$
B) $6 - 6 i$
C) $6 - 4 i$
D) $- 6 + 6 i$