On January 1, 20X1, X Corporation issued $100,000 face value of 20-year bonds, paying 9% (contractual rate) interest annually on December 31. At the time of their issue, buyers demanded a 10% (market rate) return on their investment, and the cash proceeds of the issue to X Corporation amounted to $91,486. If the corporation uses the effective interest method, the amount of discount amortization to be recorded on December 31, 20X1 is:

a. $9,000

b. $8,514

c. $ 765

d. $ 486