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A
Gold, Silver, Bronze, Platinum — marketing names only
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B
Bronze (60/40), Silver (70/30), Gold (80/20), Platinum (90/10) — the percentage split between insurer and insured for covered costs after the deductible
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C
They represent the level of network access
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D
They determine eligibility for subsidies
Why this is the answer
ACA metal tiers define actuarial value — the expected percentage of costs the plan pays for an average enrollee. BRONZE (60/40): insurer pays 60%, insured pays 40%; lowest premium, highest out-of-pocket. SILVER (70/30): 70/30 split; medium premium; Silver plans are the benchmark for premium tax credits; cost-sharing reductions (CSRs) available for lower-income enrollees. GOLD (80/20): 80/20 split; higher premium, lower out-of-pocket. PLATINUM (90/10): insurer pays 90%; highest premium, lowest out-of-pocket; worth it for people with frequent medical needs. These are averages — individual plan design varies within each tier.
Source: Health Insurance Exam, ACA Metal Tiers