Write in Terms of I $\sqrt { - 168 }$ A) $2 \mathrm { i } \sqrt { 42 }$

Multiple Choice

Write in terms of i.
- $\sqrt { - 168 }$

A) $2 \mathrm { i } \sqrt { 42 }$
B) $- 2 \sqrt { 42 }$
C) $- 2 \mathrm { i } \sqrt { 42 }$
D) $2 \sqrt { 42 }$