Here's a problem to solve: At the beginning of a science class, the teacher opened a small sealed jar and placed it on a table. The contents of the jar spread throughout the room during class. Which of the following did the jar most likely contain?

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

- A: cloth fibers
 
- B: oxygen gas
 
- C: saltwater
 
- D: snowflakes
 