Find the Length of the Third Side of the Right $c$

Multiple Choice

Find the length of the third side of the right triangle. Assume that $c$ represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places.
- $b=8, c=16$

A) $a=\sqrt{128} ; a \approx 11.314$
B) $\mathrm{a}=\sqrt{24} ; \mathrm{a} \approx 4.899$
C) $a=8$
D) $\mathrm{a}=\sqrt{192} ; \mathrm{a} \approx 13.856$