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For a plural noun that already ends in -s (nurses), form the possessive by adding only an apostrophe after the s: nurses’ lounge—option B. Option A (nurses’s) incorrectly adds an extra ’s to a regular plural. Option C (nurse’s) is singular possessive and would mean one nurse owns the lounge—contrary to the prompt’s “group of nurses.” Option D misplaces the apostrophe and creates an awkward, unidiomatic “of” phrase. TEAS frequently checks possessives with plural owners (patients’ charts, doctors’ offices), singular owners (patient’s chart), and irregular plurals (children’s ward). A quick rule: identify the base noun and whether it is singular or plural; for regular plurals ending in -s, append ’ only; for singulars and irregular plurals (children, men, women), add ’s. In professional writing, clear possession prevents ambiguity about ownership or responsibility (e.g., “the patients’ rights forms” vs “the patient’s rights form”). When in doubt, paraphrase with of: “the lounge of the nurses” indicates a plural owner, guiding you to nurses’.