[单选题]
What principle is responsible for alternating light and dark bands when lighthh a:/+ec6 dw7okw) hsy id*s7ryc7tr(l) a fr3t ,2xg passes arf7,rlt gxy(c3r 2 )tthrough two or more narrow slits?
A. refraction
B. polarization
C. dispersion
D. interference
