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: A student uses a bar graph to display the amount of rainfall per week over a 3-month period. Which other method of presentation is appropriate for the data?  
 (A) a table (B) a pie chart (C) a photograph (D) a written paragraph

Output: A


Input: Consider Input: Which of the following Earth layers has the greatest density?  
 (A) crust (B) mantle (C) inner core (D) outer core

Output: C


Input: Consider Input: Carolina wrens and painted buntings are two bird species that live in overlapping territories. They have different requirements for food and nesting. Which term best describes the relationship between the two species?  
 (A) parasitism (B) symbiosis (C) coexistence (D) mutualism


Output: C