7064. The people attending the carnival looked gay and happy.

✅ The correct answer is option D.
Occasion : a particular event, or the time at which it takes place.

Fair : a gathering of stalls and amusements for public entertainment.

Function : an activity that is natural to or the purpose of a person or thing.

Revelry : lively and noisy festivities, especially when these involve drinking a large amount of alcohol.

Carnival : a travelling funfair or circus.

Synonym of Carnival is Fair