Perform the Indicated Operation $( 9 - 3 i ) - ( 9 - i )$

Multiple Choice

Perform the indicated operation. Write the result in the form a + bi.
- $( 9 - 3 i ) - ( 9 - i )$

A) $- 2 \mathrm { i }$
B) $18 - 4 \mathrm { i }$
C) $- 4 \mathrm { i }$
D) $18 - 2 \mathrm { i }$