下列选项中，哪一个是通过夹具将形状ps和物体body连接在一起：

A、FixtureDef
fd = new FixtureDef();
fd.shape = ps;
body.createFixture(fd);;

B、FixtureDef
fd = new FixtureDef();
fd.shape = ps;BodyDef bd=new BodyDef();
body=box2d.createBody(bd); ;

C、Fixture
fd = new Fixture();
fd.shape = ps;
body.createFixture(fd);;

D、Fixture
fd = new Fixture();
fd.shape = ps;BodyDef bd=new BodyDef();
body=box2d.createBody(bd);