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17.  Charges Q, 2Q and 4Q are uniformly distributed in three dielectric solid spheres 1, 2 and 3 of radii R / 2, R and 2 R respectively, as shown in the figure. If  magnitudes of the electric fields at point P at a distance R from the centre of spheres 1, 2 and 3 are E₁, E₂ and E₃  respectively  then

$$\begin{gathered} \left(a\right) E_1>E_2>E_3 \left(b\right) E_3>E_1>E_2 \\ \left(c\right) E_2>E_1>E_3 \left(d\right) E_3>E_2>E_1 \end{gathered}$$