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# Under the conditions when no bias is applied across a p-n junction

(a)no current is produced as the charge carriers do not move

(b)The number of charge carriers flowing from both sides of the p-n junction get equalized so no net current flows.

(c)A small current flows

(d)Potential difference across the p-n junction is non zero.

When no bias is applied to a p-n junction the charge carriers do not move and hence no current flows.
Hence a is the correct answer.