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.
--------
Question: A scientific guess about the cause and effect of an event is called  
 (A) a variable. (B) a theory. (C) a hypothesis. (D) an observation.

Answer: C


Question: What is the function of the nucleus in a cell?  
 (A) provides energy (B) provides nutrients (C) controls activity (D) controls movement

Answer: C


Question: Which of the following is most important in producing the seasons on Earth?  
 (A) Earth's gravitational attraction to the Sun (B) the Moon's revolution around Earth (C) the distance of Earth from the Sun (D) the tilt of Earth's axis as it revolves around the Sun

Answer:
D