Please choose the correct answer to the question: Four identical candles are set on a safe surface and lit. One is covered with a small-sized jar, one is covered with a large-sized jar, and one candle is left in the open. A fourth lit candle is placed in a vacuum. Which candle will most likely stay lit the longest?

Answer1: the candle placed in the vacuum Answer2: the candle covered with the small-sized jar Answer3: the candle covered with the large-sized jar Answer4: the candle left out in the open

Answer format: answer1/answer2/answer3/answer4