A man can view through telescope two district objects at a distance of $120 \;m$ from him if he uses light of $\lambda= 550 A^{\circ}$ What must be minimum separation between objects if diameter of his pupil $D= 2.5 \;mm$

Question

$(a)\;0.032\;m \\ (b)\;1.02\;m \\ (c)\;0.06\;m \\ (d)\;2.10\;m$