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 10−⁵ radians.Assuming a wavelength of 700 nm,what is the smallest aperture (diameter) telescope that will just resolve the two stars? (1 nm = 10−⁹ m)

A) 8.5 cm
B) 4.2 cm
C) 6.1 cm
D) 3.0 cm