The correct option is C. APR stands for Annual Percentage Rate. APR is the interest rate that one has to pay on a loan in a year. APR rate can be high or low depending on the investment type and the parties involved. But the best thing to do when one want to get a loan is to go for a loan with the lowest interest rate [APR]. So, the best thing for Katie to do is to choose a loan with the lowest APR.
APY stands for Annual Percentage Yield and is only use in savings; it refers to how much one earns on his savings.