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.

[EX Q]: A gene mutates in a type of bacteria. When these bacteria reproduce asexually, this mutation can only be inherited by  
 (A) different types of bacteria. (B) cells in the bacteria that are non-reproductive. (C) bacteria cells that are missing the gene. (D) direct descendants of the bacteria.
[EX A]: D

[EX Q]: Matt is a tall, eleven-year-old boy. He has a scar on his right cheek. He is intelligent and an excellent drummer. Which of his traits did he most likely inherit?  
 (A) his height (B) his scar on his right cheek (C) his intelligence (D) his ability to play the drums
[EX A]: A

[EX Q]: Carbon on Earth is found in both living and nonliving matter. In order for carbon to be continuously available, it must be recycled. Through which process is carbon made available in the atmosphere?  
 (A) formation of fossil fuels (B) layering of soil (C) plant photosynthesis (D) forest fires
[EX A]:
D