Write the Expression in the Standard Form a + Bi $8 \mathrm { i } + ( - 6 - \mathrm { i } )$

Write the expression in the standard form a + bi.
- $8 \mathrm { i } + ( - 6 - \mathrm { i } )$

A) $- 6 + 7 i$
B) $- 6 + 9 i$
C) $6 - 9 i$
D) $6 - 7 \mathrm { i }$