单项选择题
GMDSS is able to provide reliable communication to________.
A．all large passenger vessels
B．freighters of more than 300 GT in coastal waters
C．all passenger ships and cargo ships engaged in international voyages
D．all passenger ships and cargo ships of 300 GT upwards in international voyages
B．freighters of more than 300 GT in coastal waters
C．all passenger ships and cargo ships engaged in international voyages
D．all passenger ships and cargo ships of 300 GT upwards in international voyages
