Answer:
C. pay off her credit card debit
Explanation:
Credit score used to predict the chance that someone can pay his/her loans. To improve the credit score, you can take a look at FICO credit score criteria. The scoring uses payment history and credit usage as the highest scoring. Pay off your loans and lower your credit usage will help improve credit score significantly. Skip a payment will make your score lower. Opening a new credit card also can lower your credit score.