A radio medical advice service（）ships of all nationalities and no charge is made for this service.<br>A:is available to<br>B:is available for<br>C:are available to<br>D:are available for

A radio medical advice service（）ships of all nationalities and no charge is made for this service.
A:is available to
B:is available for
C:are available to
D:are available for

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