Task: Question Answering
Input (English): In a healthy forest, dead trees and limbs fall to the ground and decompose. Which of these statements best describes why decomposition is important to a forest ecosystem?  
 (A) Nutrients are released when wood is broken down. (B) Worms produce oxygen used by other organisms. (C) Dead trees provide nest sites for many different species of birds. (D) Water is stored in dead trees and limbs.
Output (English): A