The Electric Field at Point $P$ Due to a Point Charge $Q$

The electric field at point $P$ due to a point charge $Q$ a distance $R$ away from $P$ has magnitude $E$ . In order to double the magnitude of the field at $P$ , you could

A) double the distance to $2 R$ .
B) double the charge to $2 Q$ and at the same time reduce the distance to $R / 2$ .
C) reduce the distance to $R / 4$ .
D) double the charge to $2 Q$ .
E) reduce the distance to $R / 2$ .