caroline babysat for two families the nelson and the smiths. use the information below to compare her earings.

nelson a = 6.25h, where a represents the amount she earned and h represents the number of hours she babysat.
smiths : $39 for 6 hours

witch statement is true?

A. Caroline earns $6.25 an hour babysitting for the smiths.
B. Caroline earns $6.50 an hour babysitting for the nelsons.
C. Caroline earns more money per hour from the smiths.
D. Caroline earns more money per hour from the nelsons.