[单选题]
When light illuminates a grating with 7000 lines pe0i)wpk4 k.-hotkc 4qjr centimeter,xvf 5j rp,-si+ its second order ma,-s5fpvrji+ xximum is at $62.4^{\circ}$. What is the wavelength of the light?
A. $336 \; nm$
B. $363 \; nm$
C. $633 \; nm$
D. $752 \; nm$
