Please choose the correct answer to the 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?

Answer1: its reactivity Answer2: its magnetism Answer3: its specific heat Answer4: its chemical energy

Answer format: answer1/answer2/answer3/answer4