In Comparing Artificial and Natural Selection,which of the Following Statements

In comparing artificial and natural selection,which of the following statements is true?

A) Artificial selection is slower than natural selection.
B) Artificial selection is reversible;natural selection is not.
C) Artificial selection can produce maladaptive structures,natural selection cannot.
D) Artificial selection cannot produce changes as large as changes produced by natural selection.
E) In artificial selection,the magnitude of the selection pressure can be varied;in natural selection,it cannot.