Correct Answer: Disarrange

Solution : The most appropriate antonym is the first option.

Acclimatise means adapting to a new environment or climate. The opposite of this is disarrange , which means to disrupt or disturb the order or arrangement of something.

The meanings of the other options are as follows:

• Prioritise means to arrange or deal with things in order of importance and is not directly related to the opposite of acclimatising.
• Placate means to make someone less angry or hostile by offering concessions, which is not the antonym of acclimatising.
• Decriminalise means to make an act or behaviour legal.