What Is the Refund Fraction on a 48-Month Loan Paid $\frac{68}{147}$

What is the refund fraction on a 48-month loan paid off in 32 months?

A) $\frac{68}{147}$
B) $\frac{17}{147}$
C) $\frac{32}{48}$
D) $\frac{16}{48}$