A student wants to find the density of an irregularly-shaped stone. He first measures the mass of the stone. He then places the stone into a measuring cylinder that contains water. The diagrams illustrate the measuring cylinder before and after the stone is put into it. How should the student work out the density of the stone?
- Amass of stone $\times$ reading $2$
- Bmass of stone $\times$ (reading $2$ $-$ reading $1$)
- Cmass of stone $\div$ reading $2$
- Dmass of stone $\div$ (reading $2$ $-$ reading $1$)