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]: What is a common use of the mineral graphite?  
 (A) to make glass (B) as a source of iron (C) to make pencil leads (D) as a household cleaner
[A]: C


[Q]: Which of the following is an example of a behavioral adaptation?  
 (A) hooves of a horse (B) migration of birds (C) a spider web (D) a bee hive
[A]: B


[Q]: This in turn causes the average temperature on Earth to rise. Which of the following observations supports that theory?  
 (A) The summer of 1998 was one of the hottest summer seasons on record. (B) Carbon dioxide gas from cars and industry is a product of burning that produces heat. (C) Carbon dioxide in the upper atmosphere absorbs and re-emits heat radiated from Earth's surface. (D) Radiation on Earth's surface is increasing because of a hole in the ozone layers.
[A]:
C