Task: Question Answering
Input (English): A species of moth in England has both a light-colored form and a dark-colored form. In the mid-1800s, the percentage of dark-colored moths increased in areas where black soot from factories covered the trees. The soot in these areas has decreased in more recent times as a result of pollution laws. Which of the following statements describes what has most likely happened to the moth populations in these areas?  
 (A) The moth populations went extinct. (B) The moth populations migrated south. (C) The percentage of light-colored moths in the populations decreased. (D) The percentage of dark-colored moths in the populations decreased.
Output (English): D