C because graduated terrace steps are commonly used to farm on hilly or mountainous terrain. Terraced fields decrease both erosion and surface runoff, and may be used to support growing crops that require irrigation, such as rice. ( It basically means that terraced farming is farming over steps and using rain to wash away old soil so that's where the wet part comes in)
That would be China! :D :D
Environmental protection endeavors influence the nature of our lives. Environmental insurance endeavors today will influence who and what is to come. Environmental protection arrangements require just consider what is best for the earth.
