Under the Affordable Care Act, insurers MUST offer plans within health insurance exchanges that meet...

Under the Affordable Care Act (ACA), qualified health plans offered on the individual and small-group exchanges are categorized into metal tiers based on actuarial value (AV) —the percentage of expected average medical costs the plan is designed to pay for a standard population. The ACA’s standard tiers are Bronze (60% AV) , Silver (70% AV) , Gold (80% AV) , and Platinum (90% AV) . A plan with a 70% actuarial value is therefore a Silver Plan , meaning that, on average, the insurer pays about 70% of covered healthcare expenses and covered individuals pay about 30% through deductibles, copayments, coinsurance, and other cost-sharing (not including premiums).

This question’s wording matches the defining feature of the Silver tier: 70/30 cost-sharing on average . Gold and Platinum tiers have higher actuarial values (so lower expected cost sharing), while Bronze has a lower actuarial value (higher expected cost sharing). Therefore, the required tier at 70% AV is the Silver Plan .