英语单选题一道，选什么Student A：I feel sick. Student B：______ Student A

英语单选题一道，选什么
Student A：I feel sick. Student B：______ Student A：I'm not sure， but I have got a bad headache. A. I'm sorry to hear that. B. How are you feeling now？ C. How long have you been sick？ D. Do you have a temperature？