The Plasma Membrane of an Excitable Cell Is More Permeable

The plasma membrane of an excitable cell is more permeable to K⁺ because

A) of its positive electrical charge.
B) there are more leak ion channels for K⁺ than Na⁺.
C) protein molecules cannot exit through the plasma membrane.
D) calcium ions block Na⁺ and Cl^- channels.
E) there are more gated channels for K⁺.