A student stirs a cup of hot chocolate with a cold metal spoon and observes that the spoon becomes warmer. According to the law of conservation of energy, which answer choice best describes why the spoon became warmer? The high-energy hot chocolate particles transfer some of their energy to the spoon particles, which causes the spoon to become warmer. The high-energy spoon particles destroy some of the hot chocolate particles, which causes the spoon to become warmer. The high-energy hot chocolate particles destroy some of the spoon particles, which causes the spoon to become warmer. The high-energy spoon particles transfer some of their energy to the hot chocolate particles, which causes the spoon to become warmer.