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.

Which material best conducts heat and electricity?  
 (A) metal (B) plastic (C) rubber (D) wood
A

Claudia's teacher places a photograph of an organism on the board. He asks Claudia to determine if the organism is a plant or an animal. The answer to which question will best help Claudia determine if the organism is a plant or an animal?  
 (A) Does the organism have cells? (B) Does the organism reproduce? (C) Does the organism live in the forest? (D) Does the organism make its own food?
D

Which activity is an example of a chemical change?  
 (A) dissolving table salt in water (B) hammering aluminum into thin sheets (C) melting gold to make jewelry (D) burning wood to produce ashes

D