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 stars of 4×10−⁵ radians.Assuming a wavelength of 500 nm,what is the smallest aperture (diameter) telescope that will just resolve the two stars? (1 nm = 10−⁹ m)

A) 1.2 cm
B) 1.5 mm
C) 1.5 cm
D) 4.8 cm
E) ​20 mm