White Light Is Spread Out into Spectral Hues by a Diffraction

Multiple Choice

White light is spread out into spectral hues by a diffraction grating.If the grating has 1 000 lines per cm,at what angle will red light ( $\lambda$ = 640 nm) appear in first order?

A) 14.7 $\degree$
B) 7.35 $\degree$
C) 17.7 $\degree$
D) 3.67 $\degree$
E) 1.84 $\degree$