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________ the problem of land erosion getting more serious, the government is searching for a way to deal with it.?

A.As                     B.With                  C.When                 D.If

 _____the problem of land erosion getting more serious, the government is searching for a way to deal with it.    

A. As                 B. With                C. When                    D. If

 _____the problem of land erosion getting more serious, the government is searching for a way to deal with it.   

A. As          B. With               C. When         D. If

_________ the problem of land erosion getting more serious, the government is searching for a way to deal with it.

A．As    B．With  C．When       D．Because

_________ the problem of land erosion getting more serious, the government is searching for a way to deal with it.