One Word Substitution

DIRECTIONS : In each of the following questions, out of the four alternatives, choose the one which can be substituted for the given words/sentence.
11. An entertainer who performs difficult physical actions
  A.  Clown
  B.  Patriot
  C.  Metropolitan
  D.  Cosmopolitan
12. A light sailing boat built especially for racing
  A.  Canoe
  B.  Frigate
  C.  Yacht
  D.  Dinghy

13. One who cannot die
  A.  Stable
  B.  Perpetual
  C.  Immortal
  D.  Perennial
14. A small house with all rooms on one floor
  A.  Flat
  B.  Bungalow
  C.  Castle
  D.  Cottage
15. Part of a church in which bells hang
  A.  Spire
  B.  Belfry
  C.  Chapel
  D.  Minaret