Perform the Operation $( 3 - 4 i ) + ( 6 + 6 i )$

Multiple Choice

Perform the operation $( 3 - 4 i ) + ( 6 + 6 i )$ and write the result in standard form.

A) $9 + 2 i$
B) $9 - 2 i$
C) $9 i + 10$
D) $9 + 10 i$
E) $9 i - 2$