In a Young's Experiment, the Paths from the Slits to a Point

In a Young's experiment, the paths from the slits to a point on the screen differ in length, causing destructive interference at the point. Which of the following path differences would cause this destructive interference?

A) 3 $\lambda$ /2
B) 4 $\lambda$
C) 5 $\lambda$
D) None of these choices.