An "Acre Foot" Is

An "acre foot" is

A) the depth of irrigation necessary to grow crops in West Texas.
B) the amount of property an owner must gain rights to before he can drill an oil or natural gas well.
C) the amount of electricity necessary to light an acre of property.
D) the amount of water necessary to cover an acre of land a foot deep.
E) a term for "getting one's foot in the door" before a person can occupy unclaimed farm land.