Passage Summary: Too much of certain vitamins is poisonous, and since many people eat way more cereal than the box says is a 'serving,' they might be getting way more vitamins than is safe.

Reasoning: High levels of vitamins A and D are toxic; some fortified foods contain 100% of the daily requirement per serving; many people eat two to three times the official serving size.

Analysis: Since this is a 'Most Strongly Supported' question, we must treat the premises as facts and find the most logical inference. If one serving provides the full daily limit and people are habitually eating triple that amount, it follows that these people are consuming vitamins A and D at potentially toxic levels. Look for an answer that connects the dots between the toxicity of the vitamins, the high concentration in the food, and the common behavior of over-serving. Avoid choices that use overly strong language like 'everyone' or 'must.'