The Hydrogen Spectrum Has a Red Line at 656 Nm,and $\degree$

Multiple Choice

The hydrogen spectrum has a red line at 656 nm,and a blue line at 434 nm.What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm?

A) 7.7 $\degree$
B) 16.6 $\degree$
C) 6.6 $\degree$
D) 3.2 $\degree$
E) 19.2 $\degree$