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: Thomas Edison most likely invented the light bulb by using  
 (A) lit candles. (B) atomic models. (C) reflected light. (D) the scientific method.

Output: D


Input: Consider Input: Which of the following is least likely to allow electricity to flow?  
 (A) aluminum (B) copper (C) plastic (D) water

Output: C


Input: Consider Input: The weight of an object changes at different locations on Earth. Which is a measurement of weight?  
 (A) 20 mL (B) 16 N (C) 45 m (D) 90°C


Output: B