The mass density of a spherical body is given by ρ( r )=k/r for r ≤ R and ρ( r )=0 for r > R, where r is the distance from the centre. The correct…

The mass density of a spherical body is given by $\displaystyle \rho(\mathrm{r})=\frac{\mathrm{k}}{\mathrm{r}}$ for $\displaystyle \mathrm{r} \leq \mathrm{R}$ and $\displaystyle \rho(\mathrm{r})=0$ for r > R, where r is the distance from the centre. The correct graph that describes qualitatively the acceleration, a, of a test particle as a function of r is :