Nitrogen Molecules of Mass,m = 4

Nitrogen molecules of mass,m = 4.648 * 10^-26 kg each,have a speed of 270 m/s and are incident on a double slit.How far apart are the double slits if a nitrogen molecule fringe pattern,with fringes 0.40 cm apart,is observed on a screen 60.0 cm in front of the slits.

A) 5.28 * 10^-9 m
B) 6.19 * 10^-9 m
C) 7.18 * 10^-9 m
D) 7.92 * 10^-9 m