If the emission of something that smells like rotten eggs causes acid rain, then the emission of what causes acid rain?

Answer choices:
- Material carrying electricity
 - decomposing dead organisms
 - DNA damage and mutations
 - soil loss through hurricanes
 - Something that smells like rotten eggs
 - extreme heat and pressure
 - chemical compound NaCl
 - generating heat by burning

 

     Something that smells like rotten eggs     