The box plots show the average gas mileage, in miles per gallon, of the cars sold at a dealership in June and in December
Gas Mileage of Cars Sold in June

which inference can be made about cars?

a) The type of cars sold in June typically gets better gas mileage

b) The type of cars sold in December typically gets better gas mileage

c) The type of cars sold in the two months typically get about the same gas mileage

d) The types of cars sold in the two months typically get better gas mileage then those sold in other months

please help, thanks!