[单选题]
If a wave from one slit of a u .abwc,io-1yofnl 8 pcvc.k d)aj88. Youngd/o/z*3cbg hc 's double slit experiment arrives at a point on the screen one-half waveleng*gczd h/ 3/bocth behind the wave from the other slit, which is observed at that point?
A. bright fringe
B. dark fringe
C. gray fringe
D. multi-colored fringe