Design a concise dietary rule for pregnant people that integrates biomagnification principles to minimize mercury exposure from seafood, and choose the option that best synthesizes the scientific concept into actionable guidance.

• A. Eat only farmed fish because farming eliminates biomagnification entirely in all cases and guarantees zero mercury accumulation regardless of species, origin, or feeding practices.
• B. Avoid all fish entirely during pregnancy because the possibility of any mercury exposure outweighs the nutritional benefits of omega-3s, making seafood universally unsafe for this group.
• C. Select fish solely based on price and availability because economical choices will naturally include species with low mercury, removing the need to consider trophic level or biomagnification when planning diet.
• D. Prefer low-trophic-level fish (small, shorter-lived species like sardines, anchovies, and salmon) and avoid high-trophic-level predatory fish (e.g., tuna, swordfish, shark) that biomagnify mercury through the food chain; limit overall seafood portions to recommended weekly servings.

Answer: (D)