Stopping potential is the negative potential applied to the anode (collector) so that even the fastest photoelectron emitted from the cathode (emitter) does not reach to anode due to the repulsion. Hence no photocurrent is observed. This does not mean that emission of photoelectrons is stopped. These photoelectrons are accumulated near the emitter plate (cathode). Hence option A, C and D are not true. Therefore, it can be said that the photoelectrons are emitted but re-absorbed by the emitter plate.