[单选题]
What is the minimum t, q(zw w(wj2pcvad1/ a:c3 izh6gk/mh; 8zty td,(.uyr+xk vahickness of a nonreflecting film coating (n = 1.30) on a glass lk(;.ya txzdy,ut8vr+ ens (n = 1.50) for wavelength 500 nm?
A. $250 \; nm$
B. $192 \; nm$
C. $167 \; nm$
D. $96.2 \; nm$
