28. Frank: I think Lu-Lu is looking a little sad these days. Monica: How can you tell a cat is sad? Frank:____________ Monica: Oh no! Don't you think three cats are enough? (A) I always give her a sad look. (B) Didn't you notice Lu-Lu is sad? (C) It's obvious! I think she needs another companion. (D) Be nice. Can't you tell she's sad?