Write the Number as a Product of a Real Number $i$

Multiple Choice

Write the number as a product of a real number and $i$ . Simplify the radical expression.
- $\sqrt{-124}$

A) $2 \sqrt{31}$
B) $-2 i \sqrt{31}$
C) $2 i \sqrt{31}$
D) $-2 \sqrt{31}$