Please choose the correct answer to the question: Yumiko gave some reasons why kettles and kitchen pans are often made of copper. Which reason is correct?

Answer1: Copper is a good conductor of heat. Answer2: Copper is easy to melt. Answer3: Copper is difficult to shape. Answer4: Copper dissolves in hot water.

Answer format: answer1/answer2/answer3/answer4
Answer: answer1