You are given a science question (easy-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: A student notices a paw print while walking in a park. The paw print could be considered a fossil if the print was in ___.  
 (A) rock (B) topsoil (C) thick mud (D) loose sand
Example Output: A

Example Input: Which two life processes occur in both plants and humans?  
 (A) growing and reproducing (B) germinating and making food (C) growing and making food (D) germinating and reproducing
Example Output: A

Example Input: Which of these is required to support the theory of star formation?  
 (A) laws passed by the government (B) Internet sites discussing star formation (C) pictures of stars of different ages (D) evaluation of data by many scientists
Example Output:
D