Answer:
b. Object B has a greater density than object T.
Step-by-step explanation:
When an object stay balance while submerged, its gravity must be the same as the buoyancy force, which is the same as the liquid weight displaced by the submerged volume:



where
are densities of the object and liquid, respectively.
are the volume submerged and the object volume, respectively.
If object B is fully submerged then the density of object B is the same as the liquid density (because
).
As for object T as it's only partially submerged, the mass of the liquid displaced is same as mass of object. And while the volume displaced is only a portion of the whole object volume (
), this means that the liquid density is greater than object T's density.
Therefore, object B has a greater density than object T.