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Irregular plurals that do not end in –s (children, men, women) form the plural possessive by adding ’s. Therefore, children’s temperatures (A) shows that the temperatures belong to multiple children. Option B incorrectly tacks the apostrophe after an imagined “childrens,” which is not a valid plural form. C lacks any possessive marking. D misplaces the apostrophe on “temperature’s,” implying that the temperature owns something. TEAS often tests possessives with irregular plurals: men’s room, women’s health, people’s rights. A quick check is to paraphrase with “of”: “the temperatures of the children” → children’s temperatures. Also keep agreement: a plural owner (children) + plural thing owned (temperatures). Avoid inserting apostrophes into plain plurals; apostrophes signal possession (or contractions), not plurality. Clear possessive structure is especially important in clinical documentation when attributing measurements or symptoms to the correct patient group.