What is the importance of monitoring underwater structures of the sea floor ?

By planning water profundity, the state of the ocean bottom and coastline, and the area of potential hindrances, hydrography assists with keeping our sea transportation framework moving securely and productively, both adrift and in the Great Lakes. Hydrography is likewise used to recognize wrecks and protect our oceanic legacy

I think the correct answer from the choices listed above is option B. A vast glacier in motion forming a U-shaped valley on its wake could result in secondary succession. This type of succession is a response to a disturbance, for example, forest fire, tsunami, flood, or an abandoned field.