Which of Two Diffraction Gratings,one with N₁ and the Other

Multiple Choice

Which of two diffraction gratings,one with N₁ and the other with N₂ slits per centimeter,has the greater resolving power if N₁ is greater than N₂?

A) the grating with N₁ slits per centimeter
B) the grating with N₂ slits per centimeter
C) They both have the same resolving power,but the one with N₁ slits per centimeter has sharper spectral lines.
D) They both have the same resolving power,but the one with N₂ slits per centimeter has sharper spectral lines.
E) The width of the individual slits must be known to answer this question.