Final answer:
When something is permanently frozen, it stays in a solid state indefinitely, not reaching the conditions necessary for it to melt.
Step-by-step explanation:
When something is said to be permanently frozen, it means option C) It remains frozen indefinitely. This term implies that the substance is frozen and will stay in that state for an indefinite period without melting. Melting occurs when a solid receives enough energy to partially overcome the forces holding its molecules or ions in fixed positions, converting it into a liquid. The transition from solid to liquid, or melting, occurs at a substance's melting point, which is a specific temperature unique to each substance. On the other hand, when we speak of something being permanently frozen, it suggests that the substance isn't expected to reach its melting point due to environmental or other conditions, thus maintaining its solid state.