Sentence 1: Kay was shopping and forgot to use her coupons. 
 Sentence 3: She waited 10 minutes at the service desk 
 Sentence 4:  The cashier took her coupons and gave her $4 in return 
 Sentence 5:  She decided she would always get her refund if she forgot her coupons 
 Option 1: This was the 2nd time she had forgotten and decided to get a refund. 
 Option 2: This was the 2nd time she had forgotten, and she didn't know that she could get a refund.