Avery , Blake , Clark and Doyle each live in an apartment. Their apartment are arranged like this :

          +---+---+---+---+
          | A | B | C | D |  --> East
          +---+---+---+---+

1. One of the four is the landlord.
2. If Clark's apartment is not next to Blake's apartment, then the landlord is Avery & lives in apartment A.
3. If Avery's apartment is east of Clark's apartment, then the landlord is Doyle and lives in apartment D.
4. If Blake's apartment is not next to Doyle's apartment, then the landlord is Clark and lives in apartment C.
5. If Doyle's apartment is east of Avery's apartment, then the landlord is Blake and lives in apartment B.

Who is the landlord?