An electric dipole of dipole moment $5.0 \times 10^{-8} \text{ Cm}$ is placed in a region where an electric field of magnitude $1.0 \times 10^3 \text{ N/C}$ acts at a given instant. At that instant the electric field $\vec{E}$ is inclined at an angle of $30^\circ$ to dipole moment $\vec{P}$. The magnitude of torque acting on the dipole, at that instant is : (A) $2.5 \times 10^{-5} \text{ Nm}$ (B) $5.0 \times 10^{-5} \text{ Nm}$ (C) $1.0 \times 10^{-4} \text{ Nm}$ (D) $2.0 \times 10^{-6} \text{ Nm}$