A Parallel Plate Capacitor Is Fully Charged at a Potential $\kappa$

A parallel plate capacitor is fully charged at a potential V. A dielectric with constant $\kappa$ = 4 is inserted between the plates of the capacitor while the potential difference between the plates remains constant. Which one of the following statements is false concerning this situation?

A) The energy density remains unchanged.
B) The capacitance increases by a factor of four.
C) The stored energy increases by a factor of four.
D) The charge on the capacitor increases by a factor of four.
E) The electric field between the plates increases by a factor of four.