In Comparing Two Gratings, the One with the Greater Resolving

In comparing two gratings, the one with the greater resolving power must invariably provide for

A) a larger angular separation of adjacent maxima for the two wavelengths.
B) a smaller angular spread from the maxima of each wavelength to the adjacent minima.
C) a larger ratio of angular separation of the two wavelengths to angular spread from maxima to minima for each.
D) a smaller ratio of angular separation of the two wavelengths to angular spread from maxima to minima for each.