Write the Expression in the Standard Form a + Bi $( 6 - 7 i ) + ( 3 + 3 i )$

Multiple Choice

Write the expression in the standard form a + bi.
- $( 6 - 7 i ) + ( 3 + 3 i )$

A) $9 + 4 i$
B) $- 9 + 4 \mathrm { i }$
C) $3 + 10 \mathrm { i }$
D) $9 - 4 \mathrm { i }$