An electric dipole with dipole moment $4 \times 10^{-14} \ C \cdot m$ is aligned at $30^{\circ}$ with the direction of a uniform electric field of magnitude $5 \times 10^4 \ N/C$. The magnitude of the torque acting on the dipole is:
- A$10^{-9} \ N \cdot m$
- B$10^{-5} \ N \cdot m$
- C$10^{-10} \ N \cdot m$
- D$10^{-4} \ N \cdot m$
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