Using the difference estimation method, an auditor has properly calculated the estimated total audited value of a population as $100,000. Her sample included 100 of the population's 20,000 items. She found that, in her sample, the average audited value was $1 more than the average book value. What was the projected understatement?

A $25,000.

B $0.

C $10,000.

D $20,000.