Please answer the following question: You are presented with the question "What is contributing to the greenhouse effect?" and the following answer choices: - energy of moving objects - mining gold - Warm air moving into cold air - burning fossil fuels - acid rain - melting ice caps - energy usage - single-celled organisms Now knowing that burning fossil fuels increases the carbon in the atmosphere and this atmospheric carbon might be contributing to the greenhouse effect, choose the best answer.
A:
burning fossil fuels