The correct option is D All
Relative density has its applications in our everyday lives. These are the following;-It is used during the design of various structures of ship and planes.A ship has to be hollow so as to float as this reduces its density. Materials used for building the parts of aeroplanes should be light e.g., aluminiumRelative density can be used in determining the density of unknown substance using knows density of another.Density is used by geologists and mineralogists to help them to determine the mineral content of a rock in other samples.It aids in the identification of gemstones. Density is also considered during the design of swimming and diving.