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

Answer: A


Question: Scientists wonder how the Egyptian pyramids were built. They think that the huge blocks of stone may have been put into place by pushing them up a sloping pathway. The pathway is which type of simple machine?  
 (A) lever (B) pulley (C) inclined plane (D) wheel and axle

Answer: C


Question: Which device directly converts chemical energy into electrical energy?  
 (A) solar-powered calculator (B) wood-burning stove (C) battery-powered flashlight (D) wind-powered sailboat

Answer:
C