Let $$E_1 (r), E_2 (r)$$ and $$E_3 (r)$$ be the respective electric fields at a distance r from a point charge Q, an infinitely long wire with constant linear charge density $$\lambda$$, and an infinite plane with uniform surface charge density $$\sigma$$. If $$E_1 (r_0) = E_2 (r_0) = E_3 (r_0)$$ at a given distance $$r_0$$, then

A

$$Q = 4 \sigma \pi r_0^2$$

B

$$r_0 = \frac{\lambda}{2 \pi \sigma}$$

C

$$E_1 (\frac{r_0}{2}) = 2E_2 (\frac{r_0}{2})$$

D

$$E_2 (\frac{r_0}{2}) = 4E_3 (\frac{r_0}{2})$$