Complete the Following Statement: When a Dielectric with Constant $\kappa$ Is Inserted Between the Plates of a Charged Isolated Capacitor

Complete the following statement: When a dielectric with constant $\kappa$ is inserted between the plates of a charged isolated capacitor

A) the capacitance is reduced by a factor $\kappa$ .
B) the charge on the plates is reduced by a factor of $\kappa$ .
C) the charge on the plates is increased by a factor of $\kappa$ .
D) the electric field between the plates is reduced by a factor of $\kappa$ .
E) the potential difference between the plates is increased by a factor of $\kappa$ .