[单选题]
When light illuminates a grating with 7000 lines perfbvyp;a b)nzzv2rt676 /7vx i centimeter, its* .o d(he1ob6qral*f b.7nvjb second order maxi dl.(no j*e7 f v.ha6bqbbor1*mum is at $62.4^{\circ}$. What is the wavelength of the light?
A. $336 \; nm$
B. $363 \; nm$
C. $633 \; nm$
D. $752 \; nm$
