Let $P(r) = \frac{Q}{\pi R^4} r$ be the charge density distribution for a solid sphere of radius R and total charge Q for a point 'p' inside the sphere at distance $r_1$ from the centre of the sphere, the magnitude of electric field is

Question

( A ) $\frac{Qr_1^2}{3 \pi \varepsilon_0 R^4}$
( B ) $\frac{Q}{4 \pi \varepsilon_0 r_1^2}$
( C ) 0
( D ) $\frac{Qr_1^2}{4 \pi \varepsilon_0 R^4}$