【单项选择题】In the second paragraph, the writer talks about someone saying “You are a lucky dog. ” He is saying that ______.
选项：

A:the speaker of this sentence is just being friendly
B: “dog” can’t be used to refer to people
C:this saying means the same as “You are a lucky guy” or “you are a lucky gal”
D:sometimes the words used by a speaker give a clue to the feeling behind the words