Monochromatic Light Is Normally Incident on a Diffraction Grating $\theta$ And Has Width W

Multiple Choice

Monochromatic light is normally incident on a diffraction grating. The m^th order line is at a angle of diffraction angle $\theta$ and has width w. A wide single slit is now placed in front of the grating and its width is then slowly reduced. As a result:

A) both $\theta$ and w increase
B) both $\theta$ and w decrease
C) $\theta$ remains the same and w increases
D) $\theta$ remains the same and w decreases
E) $\theta$ decreases and w increases