Express the Number in Terms of I $- \sqrt { - 4 }$

Multiple Choice

Express the number in terms of i.
- $- \sqrt { - 4 }$

A) $2 \mathrm { i }$
B) $- \sqrt { 2 } \mathrm { i }$
C) $- 2 \mathrm { i }$
D) $\sqrt { 2 } \mathrm { i }$