Task: Question Answering
Input (English): Students are observing two fossils in a lab. They are told by the teacher that the fossils were found in different rock layers. What can the students most likely determine from just observing the fossils?  
 (A) how each organism died (B) the exact age of the fossils (C) when the fossils were discovered (D) the type of environment in which the organisms lived
Output (English): D