volcanic emissions combustion of fossil fuels destruction of tropical forests mining and mineral extraction
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Gaseous sulfur dioxide is a compound that combines with water in the atmosphere to form acid rain. What is the primary source of sulfur dioxide?
Possibilities:
- volcanic emissions
- combustion of fossil fuels
- destruction of tropical forests
- mining and mineral extraction

combustion of fossil fuels