Liquid Z will have the lowest density among the three. Option C
An object's density in relation to the liquid's density determines its ability to float on it. According to Archimedes' principle, if an object's average density is lower than the fluid's density, it will float in a liquid or gas.
The object will probably float on the liquid if both the liquid's density and the object's density are low. Hence we can see that liquid Z will have the lowest density among the three of the liquids that we can see here.