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: Which of the following is the best observation of the refraction of light?  
 (A) Looking at oneself in a mirror (B) Looking at a shadow of an object (C) Viewing an object through an open window (D) Viewing an object partially in water

Answer: D


Question: The basic life functions of an organism are carried on by  
 (A) cells (B) nutrients (C) atoms (D) hormones

Answer: A


Question: A student is investigating in which type of soil a plant will grow best. Which should the student measure to answer the question?  
 (A) height of the plants (B) weight of the soil (C) amount of water used (D) temperature of the room

Answer:
A