The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?（）<br>A:To run faster than ever<br>B:To go forward<br>C:To march without stopping<br>D:A significant symbol of a great improvement in maritime communication

The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?（）
A:To run faster than ever
B:To go forward
C:To march without stopping
D:A significant symbol of a great improvement in maritime communication

出自：海船船员证

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