At a Distance D from a Point Charge Q,the Energy $\sqrt { 2 }$

Multiple Choice

At a distance d from a point charge Q,the energy density in its electric field is u.If we double the charge,what is the energy density at the same point?

A) 16u
B) 8u
C) 4u
D) 2u
E) u $\sqrt { 2 }$