What is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to e⃗ from parallel to perpendicular?

Electric potential energy of a dipole is given as

so change in the potential energy is given by

here initially it was parallel to electric field while finally it is perpendicular to the electric field

so we have

so above is the change in potential energy of dipole

it would be c. predictability