The text for mind whip states
You psychically lash out at one creature you can see within range. The target must make an Intelligence saving throw. On a failed save, the target takes 3d6 psychic damage, and it can’t take a reaction until the end of its next turn. Moreover, on its next turn, it must choose whether it gets a move, an action, or a bonus action; it gets only one of the three. On a successful save, the target takes half as much damage and suffers none of the spell’s other effects
Meanwhile, the rules state
[…] anything that deprives you of your ability to take actions also prevents you from taking a bonus action.
If the target chooses a bonus action, it technically shouldn’t be able to do so, as it was deprived of its action. Or is this a case of specific beats general?