Which will have a higher effective interest rate — a payday loan for $1900 that is due in 14 days with a fee of $80, or a payday loan for $1900 that is due in 12 days with a fee of $80?

a. a payday loan for $1900 that is due in 12 days with a fee of $80, since it has the longer period

b. a payday loan for $1900 that is due in 14 days with a fee of $80, since it has the shorter period

c. a payday loan for $1900 that is due in 14 days with a fee of $80, since it has the longer period

d. a payday loan for $1900 that is due in 12 days with a fee of $80, since it has the shorter period