How Can Action Potentials Relay Information About the Intensity of a Stimulus

Multiple Choice

How can action potentials relay information about the intensity of a stimulus, such as distinguishing between a loud and soft sound?

A) due to the decremental properties of graded potentials
B) due to electrotonic conduction
C) due to the magnitude of action potentials
D) due to the frequency of action potentials
E) due to summation of several action potentials