A Small Styrofoam Ball of Mass $0.120 \mathrm {~g}$ Is Placed in an Electric Field Of

A small styrofoam ball of mass $0.120 \mathrm {~g}$ is placed in an electric field of $6000 \mathrm {~N} / \mathrm { C }$ pointing downward. What excess charge must be placed on the ball for it to remain suspended in the field?

A) $- 57.2 \mathrm { nC }$
B) $- 18.0 \mathrm { nC }$
C) $- 196 \mathrm { nC }$
D) $- 125 \mathrm { nC }$
E) $- 16.0 \mathrm { nC }$