Question

A ship going from sea water to river water has to displace more water to (a) change the buoyant force (b) decrease the buoyant force in the same buoyant force (d) none of these​

Answer 1

Change, or increase, the buoyant force.

Step-by-step explanation:

As the salt water of the sea is denser than the river's fresh water, the boat will rise when entering the sea from the river and sink (to increase the buoyant force) when entering the river from the sea.