As we know, the coming of radio in this century made ocean sailing much ______.

As we know, the coming of radio in this century made ocean sailing much ______

1. A.
   cheaper
2. B.
   safer
3. C.
   easier
4. D.
   faster

     As we know, the coming of radio in this century made ocean sailing much ______.

A. cheaper     B. safer    C. easier     D. faster

   As we know, the coming of radio in this century made ocean sailing much ______.