Figure shows the variation of the gravitatioal acceleration $a_g$ of four planets with the radial distance $r$ from the centre of the planet for $r\geq $ radius of the planet. Plots $1$ and $2$ coincide for $r\geq R_2$ and plots $3$ and $4$ coincide for $r \geq  R_4$. The sequence of the planets in the descending order of their densities is 

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  • A

    $1$, $2$, $3$, $4$

  • B

    $4$, $3$, $2$, $1$

  • C

    $2$, $1$, $4$, $3$

  • D

    $1$, $2$, $4$, $3$

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