You are given a science question (hard-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: Which of the following actions will increase the gravitational force between two masses, m_{1} and m_{2}, by the greatest amount?  
 (A) Halve the mass of m_{1} and halve the distance between m_{1} and m_{2}. (B) Halve the mass of m_{1} and double the distance between m_{1} and m_{2}. (C) Double the mass of m_{1} and halve the distance between m_{1} and m_{2}. (D) Double the mass of m_{1} and double the distance between m_{1} and m_{2}.

Output: C


Input: Consider Input: As Archie walks to the park, he wonders which route would be faster. He decides to walk to the park using different routes and times how long it takes. Which should he do to make his comparison fair?  
 (A) walk to different parts of the park each day (B) walk with a different friend each day (C) walk at the same speed each day (D) walk at the same time of the day

Output: C


Input: Consider Input: Which best describes how the sun might compare to a different-sized star, if they were right next to each other?  
 (A) The sun would be enormous next to an average star. (B) The sun would be tiny next to one of the largest stars. (C) The sun would be extremely bright next to an average star. (D) The sun would be very dim next to one of the smallest stars.


Output: B