Suppose Your Telescope Has Perfect Mirrors and Is Limited Only

Multiple Choice

Suppose your telescope has perfect mirrors and is limited only by diffraction.If you are viewing with light of 400 nm wavelength,what diameter mirror in a space telescope would have 1.0-km resolution of objects on Mars when viewed from above the earth at a time when the Earth-Mars distance of 80 million kilometers?

A) 39 km
B) 3.9 m
C) 3.9 km
D) 39 m
E) 390 m