[单选题]
What is the minimum thicknezp+r n*lz xf kfei(2s*ys*,z 2v,w .klss of a nonreflecting film coating ttlq8.y 0j+(kx /2kmvnmhg +x(n = 1.30) on a glass lens (n = 1.50) for wavt2n+mk(/l8k x jh. y+ gmtxv0qelength 500 nm?
A. $250 \; nm$
B. $192 \; nm$
C. $167 \; nm$
D. $96.2 \; nm$
