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

1. the potential difference across the p-n junction
2. the attraction of free electrons of n-region
3. the higher hole concentration in p-region than that in n-region
4. the higher concentration of electrons in the n-region than that in the p-region

Correct answer: the higher hole concentration in p-region than that in n-region

Solution

Holes diffuse from the p-region to the n-region due to the concentration gradient, as the p-region has a higher hole concentration compared to the n-region. This diffusion is a natural process to equalize the concentration.

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