In a difference estimation sampling plan for a population of 1,500 items, an auditor found total recorded and audited values for a sample of 100 items to be \($120,000\) and \($126,000,\) respectively. What is the total projected monetary difference for the population?

a. \($6,000\).

b. $90,000.

c. $126,000.

d. Indeterminate.

Choose the correct answer.