What Conditions Must a Domain D in the Xy-Plane Satisfy

What conditions must a domain D in the xy-plane satisfy to ensure that the value of the line integral + dy should depend only on the initial and terminal points of the path C that lies in D?

A) D must be simply connected and not contain the point (1, -1) .
B) D must be connected and not contain the point (1, -1) .
C) D must not contain the point (1, -1) .
D) D must be simply connected and must contain the point (1, -1) .
E) D can be any domain in the xy-plane.