The correct answer is C. condemnation.
Adulation is excessive praise or admiration. Condemnation is the act of expressing disapproval of someone or something. In this case, the speaker is saying that the usual praise of the officers must end. This suggests that the speaker believes that the officers are not worthy of praise, or that they are being praised too much.
The other options are not as likely to be the correct answer. Back-biting is the act of speaking ill of someone behind their back. Flattery is the act of praising someone insincerely. Praise is the act of expressing approval of someone or something.
In this case, the speaker is not likely to be back-biting the officers, as this would suggest that they are speaking ill of them behind their back. The speaker is also not likely to be flattering the officers, as this would suggest that they are praising them insincerely. The speaker is most likely to be condemning the officers, as this would suggest that they believe that the officers are not worthy of praise.