In an unbiased p-n junction, holes diffuse from the p-region to n-region because

free electrons in the n-region attract them they move across the junction due to the potential difference hole concentration in p-region is more as compared to n-region (due to concentration gradient) hole concentration in n-region is more as compared to p-region

hole concentration in p-region is more as compared to n-region (due to concentration gradient)

The correct answer is Option (3) → hole concentration in p-region is more as compared to n-region (due to concentration gradient)