Add or Subtract as Indicated and Write the Result in Standard

Multiple Choice

Add or subtract as indicated and write the result in standard form.
- $$6 \mathrm { i } + ( - 9 - \mathrm { i } )$$

A) $- 9 + 5 i$
B) $- 9 + 7 i$
C) $9 - 5 \mathrm { i }$
D) $9 - 7 \mathrm { i }$