Select the wrongly spelt word.

Ostentasion

The wrongly spelled word is "Ostentasion"

Explanation of all options:

1. Mansion: Correctly spelled. It refers to a large and impressive house, typically associated with wealth and luxury.

2. Ostentasion: Wrongly spelled. The correct spelling is "Ostentation." It means a pretentious or excessive display intended to attract attention, show off wealth, or impress others.

3. Extension: Correctly spelled. It can have multiple meanings, but generally refers to the action of extending, prolonging, or adding on to something.

4. Persuasion: Correctly spelled. It relates to the act of persuading or convincing someone to adopt a particular belief, opinion, or course of action.