Which of the Following Is Not True of Conservation Tiling

Multiple Choice

Which of the following is not true of conservation tiling?

A) a method of cultivation in which residues from previous crops are left in the soil
B) residues are partially covering soil and helping it to hold seeds
C) there are several types including no tilling
D) over 70% of US farmland was planted using conservation tilling in the early 2000s
E) all these are false