The Diagram Shows a Single Slit with the Direction to a Point

Multiple Choice

The diagram shows a single slit with the direction to a point P on a distant screen (not shown) .At P, the pattern has its maximum nearest the central maximum.If X and Y are the edges of the slit, what is the path length difference (PX) - (PY) ?

A) " $\lambda$ /2"
B) " $\lambda$ "
C) "3 $\lambda$ /2"
D) "2 $\lambda$ "
E) "5 $\lambda$ /2"