Express the Number in Terms of I $- \sqrt { - 75 }$

Multiple Choice

Express the number in terms of i.
- $- \sqrt { - 75 }$

A) $- 3 \sqrt { 5 } \mathrm { i }$
B) $- 15 \mathrm { i }$
C) $- 5 \sqrt { 3 } \mathrm { i }$
D) $5 \sqrt { 3 } \mathrm { i }$