"Where will you be tomorrow," I said, "in case I have to ring you?"

• A. asked where you will be the next day in case I will ring him.
• B. asked where he would be the next day in case I had to ring him.
• C. said to him where he will be in case I have to ring him.
• D. enquired about his whereabouts the next day in case I would have to ring up.