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: Weather forecasts are more accurate today than in the past due to  
 (A) global warming (B) air-quality control (C) plate tectonics (D) use of images from space

Output: D


Input: Consider Input: Which of these is an example of water changing from water vapor to liquid?  
 (A) moisture forming on a mirror when you breathe on it (B) sweat forming on your body when you exercise (C) ice cubes melting when you put them in a warm liquid (D) rivers drying up during a very hot summer

Output: A


Input: Consider Input: From Earth, we see the sun in the day sky and other stars in the night sky. Nighttime stars look like tiny points of light. Which statement explains why nighttime stars appear so much smaller than the sun?  
 (A) The stars are much smaller. (B) The sky is much darker at night. (C) The stars are much farther away. (D) The moon blocks out most starlight.


Output: C


