根据投资环境冷热比较分析法，一国投资环境越冷，外国投资者在该国的投资参与成分越大。

A ship station on receiving a shore-to-ship distress alert should（）.

A.keep silence

B.interfere with such communication

C.establish communication as directed and render such assistance as is required and appropriate

D.refuse communication as directed and render such assistance as it required and appropriate