You are calling another vessel by radiotelephone using the International Code of Signals.H

You are calling another vessel by radiotelephone using the International Code of Signals.He responds with the words Alpha Sierra.This indicates that ().

A.he cannot accept traffic immediately

B.you should proceed with your message

C.you should send your message in International Code

D.you should send your message in plain language

请帮忙给出正确答案和分析，谢谢！