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.
- $8 \mathrm { i } + ( - 6 - \mathrm { i } )$

A) $- 6 + 7 i$
B) $- 6 + 9 i$
C) $6 - 7 i$
D) $6 - 9 i$