A Binary Star System in the Constellation Orion Has an Angular

Multiple Choice

A binary star system in the constellation Orion has an angular separation between the two stars of 1.2*10-5 radians.If $\lambda$ = 5 *10-7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars?

A) 10 cm
B) 5 cm
C) 50 cm
D) 1 m
E) 4 cm