Task: Question Answering
Input (English): Coal is solid rock that began as organic material that was deposited in a swamp. The formation of coal suggests that  
 (A) coal is made mostly of skeletal remains of animals. (B) coal is formed from magma that has solidified over time. (C) it quickly becomes petrified when water is removed. (D) geologic processes continue over millions of years.
Output (English): D