A Dipole of 7 $\mu$ CM Is Embedded in an External Electric Field of 3

A dipole of 7.6 $\mu$ C.m is embedded in an external electric field of 3.3 N/C. The angle between the dipole moment and the electric field is 180º. The potential energy of the dipole is

A) $+ 25$ $\mu$ J.
B) 0
C) $- 50$ $\mu$ J.
D) $- 25$ $\mu$ J.