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First identify the base noun and whether it’s singular or plural. Here, we refer to more than one nurse, so the base plural noun is nurses. To form the plural possessive, add an apostrophe after the plural s: nurses’. Therefore, nurses’ schedules correctly shows that the schedules belong to multiple nurses. Option B (nurse’s schedules) is singular possessive, meaning the schedules of one nurse—mismatched with the plural context. Option A mangles both number and placement (“nurses schedule’s”) and also misplaces the apostrophe relative to the word owning the schedules. Option D places the apostrophe after schedules, implying the schedules possess something, which breaks the intended meaning. TEAS English often tests apostrophes: singular possessive = add ’s (e.g., patient’s chart); plural ending in s = add apostrophe only (e.g., patients’ charts); irregular plurals not ending in s (children) take ’s (children’s).