20) C

Louisiana 
Number of wells drilled = 2327 ≈ 2400
Amount of water used = 12000
Amount of water per well = 12000/2400 = 5

Utah
Number of wells drilled = 1336 ≈ 1400
Amount of water used = 590 ≈ 600
Amount of water per well = 600/1300 = 0.46

Difference = 5-0.46 = 4.54 x 10^6 = 4,540,000 gallons per well
This figure is close to 4,500,000. So the answer is C

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