Write the Word or Phrase That Best Completes Each Statement $- \sqrt { - 252 }$

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
- $- \sqrt { - 252 }$

A) $6 \sqrt { 7 } \mathrm { i }$
B) $6 \sqrt { 7 }$
C) $- 6 \sqrt { 7 }$
D) $- 6 \sqrt { 7 } i$