Joy is taking out a car loan which she will pay back with interest. which option will require her to pay the lowest amount in interest?

There are 2 factors that would determine this , 
1. The initial amount
2. The percentage of interest

Since you provide no options, your answer will be the one with lowest amount after you multiply both the initial amount and the percentage of interest

Well first we would need the actual diagram. perhaps you missed it?

The amount of current is measured in units calledamperes or amps. one ampere of current is equal to the chargeof 6,240,000,000,000,000,000 electrons flowing past a given pointin a circuit per second