Express the Number in Terms of J (If Necessary, Round $\sqrt { - 5 }$

Multiple Choice

Express the number in terms of j (if necessary, round the result to three significant digits) . $\sqrt { - 5 }$

A) $- 2.24 j$
B) $2.24$
C) $2.24 j$
D) $- 5$
E) $5 j$