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.

Input: Consider Input: A bird eats a brightly-colored insect that tastes bad. The bird avoids preying on this type of insect again. This example is best described as  
 (A) a physical characteristic. (B) a learned behavior. (C) an inherited behavior. (D) an adaptation.

Output: B


Input: Consider Input: A scientist is searching for areas where new solar systems might form. What feature is the scientist looking for?  
 (A) a star similar to our Sun (B) a cloud of dust and gas (C) an oxygen-rich atmosphere (D) a gravitational acceleration of 9.8 m/sec2

Output: B


Input: Consider Input: Roberto is sliding down a plastic slide on the playground. After he reaches the ground, he feels a small electric shock when he touches a piece of metal. What has been built up on his body that causes the shock?  
 (A) atoms (B) electrons (C) neutrons (D) protons


Output: B