The diagram below shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.

Which of the following changes could cause the photocurrent to stop

A. Increasing the potential difference of the power supply.
B. Increasing the frequency of the UV light.
C. Increasing the intensity of the UV light.
D. Changing the metal surface to one with a smaller work function.

A