While making rounds in a senior citizens’ housing complex, the visiting nurse discovers one of her clients sobbing in her darkened apartment. On questioning the client, an 85- year-old widow, the nurse learns that her pet cat of 15 years had been put to sleep the day before. What’s the nurse’s best response ？（）
A．"It shouldn’t be hard to find another cat. You’ll feel better once you have another pet. "
B．"It was only a cat. Why are you allowing yourself to be so upset It would be different if it were a person. "
C．"I’m so sorry that your pet had to be put to sleep. I know how important your cat was to you. "
D．"It’s probably best for the cat because it was so old and ill. "