Correct option is D
The photoelectric effect is the emission of electrons from a material caused by electromagnetic radiation such as ultraviolet light. Electrons emitted in this manner are called photoelectrons.
In photoelectric effect, the electron ejected posses some kinetic energy which is proportional to the frequency of incident radiation. Stopping potential is minimum potential that is needed to stop or slow down the ejected electron before it reaches the anode. Minimum potential that is needed, must be equivalent to the kinetic energy of electron, which is further related to the applied frequency (v) and the work function of metal as follows:
