I dropped ________ and it wetted the carpet in the sitting room．

1. A.
   a coffee cup
2. B.
   a coffee’s cup
3. C.
   a cup of coffee
4. D.
   a cup’s coffee

I dropped ________ and it wetted the carpet in the sitting room．

       A．a coffee cup     B．a coffee’s cup   C．a cup of coffee D．a cup’s coffee