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Use fewer with countable nouns and less with uncountable (mass) nouns. Option B pairs the forms correctly: fewer open slots (slots are countable items) and less time (time is a mass concept). Option A should read “fewer patients” because patients are discrete, countable individuals. In C, equipment is a mass noun; the correct phrasing is “less equipment was available.” Option D is tricky: when a specific count is referenced (“ten people”), formal usage prefers fewer, as in “fewer than ten people,” though “less than ten” appears in casual speech. TEAS favors prescriptive grammar for clarity in professional writing. A quick test is to try a number: if you can say “many” or add an “-s” (many slots, many patients), use fewer; if you pair with “much” (much time, much equipment), use less. Proper word choice enhances precision in clinical documentation and policies (e.g., “fewer falls,” “less bleeding”) and prevents ambiguity when quantifying outcomes or resources.