Answer
(e)
Work Step by Step
A single hectare of corn produces $8,000$ kg of corn per year, which contains a total of $24,000,000$ kilocalories ($8,000$ kg $\times 3,000$ kcal/kg).
If each human needs $2,000$ calories per day, which means $2000\times 365$ $730,000$ calories per year, so a single hectare can feed $24,000,000/730,000$ $\approx 33$ humans per year.
The answer is (e).
