A graded hyperpolarization of a membrane can be induced by

A)increasing its membrane's permeability to Na⁺.
B)decreasing its membrane's permeability to H⁺.
C)decreasing its membrane's permeability to Cl⁻.
D)increasing its membrane's permeability to Ca⁺⁺.
E)increasing its membrane's permeability to K⁺.