Question: In 1783, Europe was unusually cold and foggy. The rain was acidic. Which event most likely caused the unusual climate in Europe that year?

  Options: 
 A. A logging company deforested millions of acres in South America.
 B. A major earthquake and tsunami changed the path of the Gulf Stream.
 C. A major volcanic eruption released ash and sulfur gas into the atmosphere.
 D. An increase in the use of automobiles released more carbon dioxide into the atmosphere. 
Answer: C