A、  B、  C、  A句子是询问我们的水运物资被推迟送达的原因的Why疑问句。

Jason’s your assistant, isn’t he?
(A)No, Curtis is.
(B)Someone will assist you.
(C)Yes, you’re always welcome.

Why was our shipment of materials delayed?
(A)Some items were out-of-stock.
(B)This afternoon, I think.
(C)I’ll postpone the appointment.