Find the Sum or Difference $3 \mathrm { i } + ( - 9 - \mathrm { i } )$

Multiple Choice

Find the sum or difference. Write the answer in standard form.
- $3 \mathrm { i } + ( - 9 - \mathrm { i } )$

A) $9 - 2 i$
B) $9 - 4 \mathrm { i }$
C) $- 9 + 4 \mathrm { i }$
D) $- 9 + 2 \mathrm { i }$