25) B

Total area of land required to produce 35 billion gallons of ethanol = 54000 + 334000 = 388,000 km² ≈ 390,000

Production per km² = (35 x 10⁹ ÷ 390,000) = (35 x 10⁵ ÷ 39) ≈ (35 x 10⁵ ÷ 40) = 9 x 10⁴ gallons

Production right now = 54000 x 9 x 10⁴ = 486 x 10⁷ = 4.86 x 10⁹ ≈ 4.9 billion gallons

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