An $0.10 \mathrm{~g}$ Flea, Having Leapt from the Surface of a Dog's Cranium

An $0.10 \mathrm{~g}$ flea, having leapt from the surface of a dog's cranium, is observed to be moving at $1.25 \mathrm{~m} / \mathrm{s}$ when it is $5.00 \mathrm{~cm}$ above the position from which it leapt. What was the elastic potential energy stored in its legs before its leap?

A) $4.9 \times 10^{-5} \mathrm{~J}$
B) $5.7 \times 10^{-3} \mathrm{~J}$
C) $1.3 \times 10^{-4} \mathrm{~J}$
D) $5.7 \times 10^{-4} \mathrm{~J}$
E) $1.3 \times 10^{-3} \mathrm{~J}$
F) $7.8 \times 10^{-5} \mathrm{~J}$