Final answer:
The cells in the heart that can create prepotentials are conductive cells, with the SA node being a prime example of these cell types.
Step-by-step explanation:
The cells in the heart that can create prepotentials are conductive cells; the SA node is an example of these types of cells that can create prepotentials. The correct answer is A. conductive cells; the SA node. Myocardial conducting cells, such as those in the SA node, are responsible for initiating and propagating the action potential that triggers heart contractions. These cells do not exhibit a stable resting potential and instead have a prepotential phase characterized by a slow influx of Na+ followed by a rapid influx of Ca2+ and outflux of K+, which generates the auto rhythmicity properties unique to cardiac muscle.