The sentence below that includes an indefinite pronoun is option 2. Everyone enjoyed the celebration.
An indefinite pronoun is a pronoun which doesn't have a particular natural referent. Endless pronouns are as opposed to clear pronouns. Endless pronouns can address either count things or noncount things.
An indefinite pronoun alludes to no particular individual, thing or sum. It is ambiguous and not unmistakable. A few commonplace endless pronouns are: all, another, any, anyone/anybody, anything, every, everyone/everybody, everything, scarcely any, many, no one, none, one, a few, some, someone/somebody.
An indefinite pronoun is a pronoun that doesn't explicitly recognize what it is alluding to. For instance, the word somebody is an endless pronoun in the sentence Someone ate the last cut of pizza.
We realize that the pronoun somebody alludes to a person however we don't have the foggiest idea about some other data about them hence option 2 is correct answer.
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