Four Charged Particles (Two Having a Charge +Q and Two

Multiple Choice

Four charged particles (two having a charge +Q and two having a charge -Q) are distributed on the xy-plane,as shown below.Each charge is equidistant from the origin.The voltage is zero at infinity.The amount of work required to move a positively charged particle from point P to point O (which is on the z-axis,below the origin) is

A) zero.
B) positive.
C) negative.
D) dependent on the path in which the charged is moved.