问题：

[单选] Which statement about radio navigational warnings is TRUE（）.

A . The topics for warnings included in HYDROLANTS，HYDROPACS，and NAVAREA warnings are the same
B . NAVAREA warnings concern only coastal navigation and inland navigation in large bays or sounds such as Puget Sound
C . The United States is responsible for NAVAREA warnings in the North Atlantic north of 7°N，and west of 15°W
D . Long range radio navigational warnings are usually broadcast by radiotelephone，radiotelegraph，and radio-teletypewriter