Find the Function Value Indicated for the Function $g ( x ) = \sqrt { x - 5 }$

Multiple Choice

Find the function value indicated for the function. If necessary, round to two decimal places. If the function value is not a real number and does not exist, state so.
-Evaluate $g ( x ) = \sqrt { x - 5 }$ for $g ( 30 )$

A) 5
B) not a real number
C) $3.24$
D) $5.48 \mathrm {~g}$