A car rental agency initially offers a car that can go 304 miles on \frac{19}{2} 19 2 gallons of gasoline. There are other vehicles available at the agency, shown below. Which of the other cars have a greater unit rate of miles per gallon than the recommended car?
a.187 miles on 17/2
b.357 miles on 21\2 gallons
c.216 miles on 27\2 gallons
d.209 miles on 11/2
e.115 miles on 5/2