Which of the following altematives is correct for a reverse bias $\mathrm{p}-\mathrm{n}$ junction?

When a p-n junction is reversed biased, the positive teminal of the battery attracts the free electrons in the n-type, whereas the negative teminal of the battery attracts the free holes in the p-type. Therefore, the holes and electrons move away from the junction, and as a result, the depletion width increases. Due to an increase in the depletion width, the potential barrier increases.
Here, option (A) is correct, and option (B) is incorrect.
It is to be understood that the increased potential barrier prevents the flow of the charge carrier across the junction. This provides a high resistance path for the circuit. Hence, the current does not flow when a p-n junction is reverse biased. Here, both options (C) and (D) are incorrect.