An N-Slit System Has Slit Separation D and Slit Width $\lambda$

An N-slit system has slit separation d and slit width a.Plane waves with intensity I and wavelength $\lambda$ are incident normally on it.The angular separation of the lines depends only on:

A) a and N
B) a and $\lambda$
C) N and $\lambda$
D) d and $\lambda$
E) I and N