Figure shows the variation of the gravitatioal acceleration $a_g$ of four planets with the radial distance $r$ from the centre ofthe planet for $r \ge $ radius of the planet. Plots $1$ and $2$ coincide for $r \ge {R_2}$ and plots $3$ and $4$ coincide for $r \ge {R_4}$ . 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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