6. Compute the present value of the following set of payments for two years: $300 each quarter for the first year and $600 each quarter for the second year. The effective annual rate is 6% and payments will begin at the end of the first quarter. A) $3,000.56 B) $3,340.77 C) $3,514.06 D) $3,854.02 E) $3,999.14

The answer is b but:

2314.48 / (1+0.014674)^4 <-- why do we put n as 4?