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 is an example of a form of electrical energy?  
 (A) lightning (B) windmill (C) radio waves (D) sound waves

Answer: A


Question: Which set contains kingdoms that contain only heterotrophs?   
 (A) Protists, Fungi (B) Bacteria, Animals (C) Plants, Fungi (D) Animals, Fungi

Answer: D


Question: Which scientist studied biology by traveling by ship to different islands observing animal life, and developed a hypothesis about how species change?  
 (A) Galileo Galilei (B) Albert Einstein (C) Charles Darwin (D) Sir Isaac Newton

Answer:
C