The old couple live in a house ________ windows face to the south, so they can have plenty of sunshine every day．

1. A.
   whose
2. B.
   of which
3. C.
   that
4. D.
   which

 The old couple live in a house ____ windows face to the south, so they can have plenty of sunshine every day.

A. whose            B. of which        C. that                D. which