Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) A capacitor has its air gap doubled and its area halved.The capacitance is unchanged.
B) If the charge on one side of a capacitor is +Q,and the other side it is -Q,then the energy in the capacitor is Q²/C.
C) Two capacitors in series always have a lower capacitance than the capacitance of either of the two alone.
D) Two capacitors in parallel always have a lower capacitance than the capacitance of either of the two alone.
E) Two capacitors differ only in the dielectric material that fills them.For the same voltage,the one with the higher dielectric constant holds less charge.