$A$ point charge $Q$ is placed inside a cavity within a solid isolated conducting sphere. Consider points $A$, $B$ and $C$, where the magnitudes of the electric fields are $E_A$, $E_B$ and $E_C$, respectively. Point $A$ is inside the material of the conductor. Points $B$ and $C$ are at the same distance from the center of the solid sphere. The correct option is:

• A
  $E_A = 0$, $E_B = E_C$
• B
  $E_A \neq 0$, $E_B = E_C$
• C
  $E_A = 0$, $E_B > E_C$
• D
  $E_A \neq 0$, $E_B < E_C$