Which of the Following Is the Most True

Multiple Choice

Which of the following is the most true?

A) At this time, soil is eroding in the U.S. about 10 times faster than it is forming.
B) Soil erosion is always easily reversible, using conservation techniques.
C) Very little farmland in the United States has experienced moderate to severe erosion lately.
D) The most important agent of soil erosion is winter frost heave.