Under the Erie doctrine, which pairing best describes the general rule for choice-of-law?

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The Erie doctrine in this context says that a federal court sitting in diversity uses state substantive law to determine the rights and obligations of the parties, while it uses federal procedural law to govern the conduct and mechanics of the litigation. In terms of choice-of-law, the general rule is that the state substantive law applies to substantive issues (like elements of a claim or damages) and federal procedural law applies to procedural matters (like how the case is brought, tried, and governed in court). This keeps substantive rights aligned with state policy but preserves uniform federal procedure across courts. The option describing state substantive law and federal procedural law best captures this balance. Other choices would wrongly assign substantive rules to federal law or procedural rules to the states.