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Detail/evidence questions ask which statement the passage explicitly supports. The text states that “timing matters,” warns that too-long afternoon naps can lead to grogginess (sleep inertia), and notes that “brief, earlier naps” can refresh attention and help evening study. These lines directly support C: both nap timing and duration affect how alert one feels afterward. Option A is contradicted by “timing matters” and the contrast between long and brief naps. Option B overgeneralizes with “always better,” whereas the passage cautions against longer afternoon naps. Option D is refuted by the line connecting earlier naps to improved evening study sessions. For Nelson–Denny precision, anchor each option to a quoted or paraphrased clause from the passage. Prefer choices that restate relationships already present (timing ↔ alertness) and avoid absolutist language (“always,” “identical”) unless the text itself is absolute. This disciplined alignment ensures accuracy under time limits.