Which of the Following Statements Best Describes the Land Available

Which of the following statements best describes the land available world-wide for increasing farming and food production?

A) Only about 50% of the world's arable land is currently being used for agriculture.
B) The amount of land available for growing food is decreasing, because some land has been converted to producing crops that can be used to make biofuels.
C) Increased efficiency will allow us to quadruple our food production in the next 25 years.
D) Converting more acres to organic farming practices will result in a large increase in food production.