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: Why are some rocks smoother and rounder than others?  
 (A) They have the shapes of the minerals from which they are made. (B) They were smoothed by the action of wind and water. (C) They were squeezed up through the soil. (D) They hardened in rounded pockets of soil.

Answer: B


Question: A shift in climate changes a forested area with little annual snowfall to an area with snowfall most of the year. Natural selection would most likely favor a rabbit with which adaptation?  
 (A) dark coat color (B) increased body fat (C) large ears to release body heat (D) more powerful legs for burrowing

Answer:
B