Krissa Wants to Buy a Horse from Gunnar

Krissa wants to buy a horse from Gunnar.Gunnar agrees to let Krissa take the horse for a week to try it out.They sign a contract for a sale on approval.Krissa rides the horse for a week,but then decides that she does not like it.Krissa

A) must still buy the horse.
B) can return the horse with no penalty.
C) can return the horse,but must buy another one from Gunnar.
D) can return the horse,but must pay a penalty fee.