Sat2 物理题At the third maxima on both sides of the zeroth frin

Sat2 物理题
At the third maxima on both sides of the zeroth fringe in a Young's double slit experiment , the light () A. travels the same time B. from the lower opening travels three times farther than the light from the upper opening. C.from the upper opening travels three times farther than light from the lower opening.D. from either opening travels 2 wavelengths farther than light from the other opening.E.from either opening travels 3 wavelengths farther than light from the other opening.