You are given a science question (hard-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: Manuel wants an area in the yard to wash the dog without making mud puddles. He wants to put something on the ground that water passes through easily. Which of these materials would be the best for him to use?  
 (A) clay (B) plastic (C) soil (D) pebbles

Answer: D


Question: When building an electrical circuit, which safety precaution should be taken first?  
 (A) use a new battery (B) wear rubber gloves (C) clean the electrical wire (D) read all directions

Answer: D


Question: Which of these is true when a piece of wood is completely burned in a fire?  
 (A) The change in the wood is reversible. (B) The energy in the wood is destroyed. (C) The change in the wood is physical. (D) The energy in the wood is transformed.

Answer:
D