Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: the candle placed in the vacuum
 
- B: the candle covered with the small-sized jar
 
- C: the candle covered with the large-sized jar
 
- D: the candle left out in the open
 