单项选择题
A．the beginning of oceanography B．the laying of the first undersea cable C．the investigation of ocean depths D．the early intercontinental communications
A．for oceanographic studies B．for military purposes C．for business considerations D．for investigating the depths of the oceans
A．the American Navy B．some early intercontinental travelers C．those who earned a living from the Sea D．the company which proposed to lay an undersea cable