Microscopes Are Inherently Limited by the Wavelength of the Light

Multiple Choice

Microscopes are inherently limited by the wavelength of the light used. How much smaller (in order of magnitude) can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50000 V than using red light (500 nm) ?

A) 3
B) 4
C) 5
D) 6
E) 14