What Is the De Broglie Wavelength of an Electron (M

What is the de Broglie wavelength of an electron (m = 9.11 × 10^-31 kg) in a 2.5 × 10³-volt X-ray tube?

A) 0.0072 nm
B) 0.011 nm
C) 0.017 nm
D) 0.031 nm
E) 0.025 nm