releases heat and is endothermic. releases heat and is exothermic. absorbs heat and is endothermic. absorbs heat and is exothermic.
When coal burns, the reaction

Options:
- releases heat and is endothermic.
- releases heat and is exothermic.
- absorbs heat and is endothermic.
- absorbs heat and is exothermic.

releases heat and is exothermic.