Task: Question Answering
Input (English): Which of the following describes a reason why companies irradiate some fruits and vegetables before they are sold to the public?  
 (A) to improve the flavors by increasing the sugar content (B) to speed up the ripening of produce picked too early (C) to partially cook the produce before canning or freezing (D) to extend the shelf life by killing existing microorganisms
Output (English): D