Sarah took out an amortized loan for $15,000 for 4 years at 10.5% to pay her college tuition. After 3 years, she decided to pay off the loan. Find the unpaid balance of the loan. (Do not round until the final answer. Then, round to the nearest cent.) A $3,929.54 B $4,356.86 C $3,897.44 D $3,876.47 Solution D.$3876.47.