Physics Electrostatics Level: Misc Level

In Figure a, small 80 g insulating sphere is suspended from point p by a silk thread that in 50 cm long.The sphere bears an unknown electric charge Q.A positive point charge q=+2.0uC is brought to a  position directly below p,and the sphere is repelled to a new position,30 cm to the right of q,asshown.The charge Qin uC, is closest to;

A)+1.5

B)+2.0

C)+2.5

D)+3.0

E)+3.5