An electric dipole is placed in a uniform electric field $\overrightarrow{\mathrm{E}}$ of magnitude 40 N/C. Graph shows the magnitude of the torque on the dipole versus the angle $\mathrm{\theta }$ between the field $\overrightarrow{\mathrm{E}}$ and the dipole moment $\overrightarrow{\mathrm{p}}$. The magnitude of dipole moment $\overrightarrow{\mathrm{p}}$ is equal to

• A

  1.25 x 10^-28 C-m

• B

  2.0 x l0^-25C-m

• C

  2.5 x 10^-28 C-m

• D

  5.0 x 10^-28 C-m