It has a total length of 49.968 km, of which 35.578 km will be built over the sea. {A

It has a total length of 49.968 km, of which 35.578 km will be built over the sea. {A、B、C}

A. 它总长度49.968公里，其中35.578公里在海上。

B. 它总长度49.968公里，其中有35.578公里是横跨在海面上的。