its reactivity its magnetism its specific heat its chemical energy
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A student leaves a rock in the Sun on a bright afternoon. An hour after sunset, the weather is cool, but the rock still feels warm. The student has demonstrated a property of the rock resulting directly from which of the rock's other properties?
Possibilities:
- its reactivity
- its magnetism
- its specific heat
- its chemical energy

its specific heat