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.

[Q]: Which of these elements is found in the greatest amount in organisms?  
 (A) carbon (B) iron (C) lead (D) neon
[A]: A


[Q]: A cut to the skin is treated with antiseptic first to avoid  
 (A) an immune response. (B) a bacterial infection. (C) bruising of tissues. (D) an allergic reaction.
[A]: B


[Q]: The presence of an animal fossil in a rock gives evidence of  
 (A) what hunting behaviors the animal used (B) how many babies the animal had (C) exactly when the animal was born (D) the time period the animal lived in
[A]:
D