The electric catfish is another electric fish that produces a voltage pulse by means of stacks of electrocytes. As the fish grows in length, the magnitude of the voltage pulse the fish produces grows as well. The best explanation for this change is that, as the fish grows,

A. The voltage produced by each electrocyte increases.

B. More electrocytes are added to each stack.

C. More stacks of electrocytes are added in parallel to the existing stacks.

D. The thickness of the electrocytes increases.