Neither of the options you have presented are good OO.  Here's the simple OO answer to your question (may not be valid C#):

<!-- language: c# -->

    interface IAccount {
      bool CanResetPassword();

      void ResetPassword();
    }

    public class Resetable {
      public bool CanResetPassword() {return true;}

      public void ResetPassword() {/* RESET PASSWORD */}
    }

    public class NotResetable {
      public bool CanResetPassword() {return false;}

      public void ResetPassword() {throw new YouCantResetPassword();}
    }