Spike Frequency Adaptation Is Mediated by A(n)

Spike frequency adaptation is mediated by a(n)

A) increase in sodium conductance with repeated action potentials.
B) decrease in sodium conductance with repeated action potentials.
C) increase in potassium conductance with repeated action potentials.
D) decrease in potassium conductance with repeated action potentials.
E) decrease in the availability of sodium channels with repeated action potentials.