Although Five- and Six-Membered Rings Are Generally the Most Stable,why $\degree$

Although five- and six-membered rings are generally the most stable,why is cyclopentane less stable than cyclohexane?

A) The angles in cyclopentane deviate significantly from the tetrahedral angle.
B) Five-membered rings have trans annular interactions.
C) Five-membered rings have eclipsing hydrogens.
D) Planar cyclohexane has bond angles closer to 109 $\degree$ .
E) Larger rings are always more stable than smaller rings.