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The passage asserts that adults learn better with spaced, daily practice plus sleep-supported consolidation, and it nods to app streaks as practical reinforcement. The strongest support would be rigorous evidence tying those elements to outcomes. Option B delivers: a yearlong randomized design (controls confounds), equal total time (isolates spacing), daily 20-minute sessions (spacing) plus sleep tracking (consolidation), and direct performance measures (retention, comprehension). Option A showcases cramming, not spacing. Option C measures enjoyment, not learning efficacy. Option D is anecdotal and idiosyncratic. On Nelson–Denny strengthen items, map passage claims to experimental features: if spacing and sleep are hypothesized drivers, choose evidence that manipulates spacing, monitors sleep, and measures learning over an adequate horizon. This alignment ensures the evidence addresses mechanism rather than merely offering popularity or single cases.