Beach is the general name of beach, river beach and lake beach, which refers to the intertidal zone between high tide level and low tide level of coastal spring tide, the beach between normal water level and flood level of rivers and lakes, the beach below seasonal water level of lakes and rivers, and the beach area between normal water level and maximum flood level of reservoirs and pits. Tidal flat is not only an important land and space resource, but also contains various marine resources such as minerals and organisms. So this question chooses option B.