The potential at points B and C, and the value of resistance R are

The correct answer is Option (3) → 10 V, 4 V, 6 $\Omega$

let the potential at point A, B, C and D be $V_A,V_B,V_C$ and $V_D$ respectively.

$V_B-V_A=10V$

$V_C-V_D=1×4=4V$ [By ohm's law]

$V_B-V_C=10-4=6V$

$R=\frac{6}{1}=6Ω$