Passage Summary: If you don't clean and seal food, it might have germs; if you do, it's germ-free. All preservation methods either kill germs and seal them out or at least slow them down.

Reasoning: Food safety depends on sterilization and sealing to eliminate bacteria, while other preservation methods focus on slowing bacterial growth or destroying enzymes.

Analysis: This is a 'Must be True' question, so we are looking for a statement that is logically guaranteed by the premises. We know that every preservation technique does at least one of two things: sterilizes/seals or slows bacterial growth. We also know that sterilization/sealing results in zero bacteria. Therefore, any food preserved by a method that does not involve sterilization and sealing must be relying on the 'slowing growth' aspect, meaning it could still contain some bacteria. Look for a choice that correctly navigates these overlapping categories.