A farmer operates a tractor on a farm to fertilize crops. The digital dashboard reads 6.5 miles per hour, 31 range, 1700 rpm.

A chart showing speed and area rate of coverage (acres per hour):

- 3 miles per hour: 5.96 acres per hour
- 3.5 mph: 6.95 acres per hour
- 4 mph: 7.95 acres per hour
- 4.5 mph: 8.94 acres per hour
- 5 mph: 9.94 acres per hour
- 5.5 mph: 10.93 acres per hour
- 6 mph: 11.92 acres per hour
- 6.5 mph: 12.92 acres per hour
- 7 mph: 13.91 acres per hour
- 7.5 mph: 14.90 acres per hour
- 8 mph: 15.90 acres per hour
- 8.5 mph: 16.89 acres per hour
- 9 mph: 17.88 acres per hour
- 9.5 mph: 18.88 acres per hour
- 10 mph: 19.87 acres per hour

A chart showing engine speed and flow rate:

- 500 rpm: 1 gallon per minute
- 750 rpm: 2.5 gallons per minute
- 1,000 rpm: 4 gallons per minute
- 1,250 rpm: 5.5 gallons per minute
- 1,500 rpm: 7 gallons per minute
- 1,750 rpm: 8.5 gallons per minute
- 2,000 rpm: 10 gallons per minute
- 2,250 rpm: 11.5 gallons per minute
- 2,500 rpm: 13 gallons per minute
- 2,750 rpm: 14.5 gallons per minute

If you continue operating the tractor at its current level, how many acres can you expect to fertilize in the next hour?

a. 5.96 acres
b. 11.92 acres
c. 12.92 acres
d. 19.87 acres