The current price of a commodity is $75. The interest rate is 8% per annum and the storage costs are 1.75% per annum, all rates are continuously compounded. If the 2-year forward price of this commodity is $67.86, then the convenience yield is ______.

a.14.75%

b.15.75%

c.16.75%

d.11.75%

e.12.75%