Write the Word or Phrase That Best Completes Each Statement $\sqrt { - 108 }$

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
- $\sqrt { - 108 }$

A) $- 6 \sqrt { - 3 }$
B) $- 6 \sqrt { 3 }$
C) $6 \sqrt { 3 }$
D) Not a real number