instruction:
You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
question:
A light year is used to measure  
 (A) time. (B) distance. (C) luminosity. (D) temperature.
answer:
B


question:
A girl found the skull of an animal. She did not know what the animal was but she was sure that it preyed on other animals for its food. What clue led to this conclusion?  
 (A) The eye sockets faced sideways. (B) The skull was much longer than it was wide. (C) There was a projecting ridge along the top of the skull. (D) Four of the teeth were long and pointed. (E) The jaws could move sideways as well as up and down.
answer:
D


question:
Which would most likely cause a decrease in the number of woodpeckers in an ecosystem?  
 (A) draining a spring-fed pond (B) plowing and planting meadows (C) destroying all dead trees and stumps (D) building a road around a small forest
answer:

C