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.

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
C

In the forest, one type of tree produces special seeds. These seeds start to grow only after going through a fire. In the fire, the adult trees are destroyed. Which resources, needed for growth, are now available to the newly growing seeds?  
 (A) sunlight and wind (B) sunlight and space (C) soil and pollen producers (D) pollen producers and space
B

Which statement explains why daylight and darkness occur on Earth?  
 (A) The Earth rotates on its axis. (B) The Sun rotates on its axis. (C) The Earth's axis is tilted. (D) The Earth revolves around the Sun.

A