Complete the statement: "As soon as the guests arrived, they quickly showed (his or her, their) invitations."

In the context of the statement, "As soon as the guests arrived, they quickly showed (his or her, their) invitations," the use of "their" is the most appropriate choice. This is because "guests," which is a plural noun, requires a plural pronoun that corresponds with it.

Using "their" provides a gender-neutral way to refer to the guests collectively, recognizing that the group may consist of individuals of any gender. This pronoun choice enhances clarity and inclusivity by avoiding the use of singular gendered pronouns like "his or her," which can feel cumbersome when referring to a plural subject.

Choosing "their" not only aligns with the grammatical agreement but also reflects a modern approach to language that acknowledges diverse identities. Therefore, it reinforces the notion of inclusivity while maintaining correct grammatical structure in the sentence.