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.

Example Input: Where does evaporation occur at the HIGHEST rate?  
 (A) rivers (B) streams (C) estuaries (D) glaciers
Example Output: C

Example Input: Which is true about the Sun and Earth?  
 (A) Earth gives light and heat energy to the Sun. (B) Earth gives only heat energy to the Sun. (C) The Sun gives light and heat energy to Earth. (D) The Sun gives only light energy to Earth.
Example Output: C

Example Input: In a lab experiment, students are testing the identity of an unknown powder. Which method is most appropriate to move the powder to a balance?  
 (A) sweep with a brush onto transfer paper (B) scoop with lab spatula onto transfer paper (C) pinch with fingers and lift onto transfer paper (D) pour from bottle onto transfer paper
Example Output:
B