Which of the Following Is True of Flood Irrigation

Multiple Choice

Which of the following is true of flood irrigation?

A) It relies solely on water that falls directly on the crop fields in the form of precipitation.
B) It results in 40% inefficient loss of the water applied.
C) It is the primary form of irrigation used in China.
D) It results in 40% inefficient loss of the water applied and it is the primary form of irrigation used in China.
E) At this time, it is the most efficient way to irrigate, from all of the known methods.