A、  B、  C、  B本句是询问谁在餐厅点了午饭的Who疑问句。

Are you free to meet on Tuesday, or should we reschedule for later in the week?
(A)Have a seat. It will only take a moment.
(B)I’m available on Tuesday.
(C)I had fun last weekend.

Who placed our lunch order with the restaurant?
(A)Sorry, we’re not taking orders right now.
(B)I think Julie did about a hatf hour ago.
(C)Yes, the food is being served.