The issue is the pronoun "they," which according to the GMAT is always plural. For decades, it has been standard to use the singular they/their to refer to one person of indeterminate gender, usually in cases where we don't have a specific person in mind: "Someone dropped their ticket." More recently, "they" has also become popular as a pronoun for individuals who don't identify as male or female. However, the GMAT is still stuck in the past and insists on "his
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