What,approximately,are the Dimensions of the Smallest Object on Earth That $\lambda$

Multiple Choice

What,approximately,are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume $\lambda$ = 500 nm light and a pupil diameter D = 0.50 cm.Assume eye fluid has an average n = 1.33.

A) 150 m
B) 100 m
C) 250 m
D) 25 m
E) 18 m