Range With [Rate] Gmat, Gre Quantitative Problem

On a recent trip, Cindy drove her car 290 miles, rounded to the nearest 10 miles, and used 12 gallons of gasoline, rounded to the nearest gallon. The actual number of miles per gallon that Cindy's car got on this trip must have been between 

A. 290/12.5 and 290/11.5 
B. 295/12 and 285/11.5 
C. 285/12 and 295/12 
D. 285/12.5 and 295/11.5 
E. 295/12.5 and 285/11.5 

Cindy drove her car 290 miles, rounded to the nearest 10 miles --> 285≤m<295$285\le m<295$;
Used 12 gallons of gasoline, rounded to the nearest gallon --> 11.5≤g<12.5$11.5\le g<12.5$;

Minimum Miles per gallon, m/g --> 28512.5<mg<29511.5$\frac{285}{12.5}<\frac{m}{g}<\frac{295}{11.5}$ 

D