Here's a problem to solve: Swamp plants die, fall to the ground, and are buried by other dying plants. Approximately how long would it take for plants to possibly become a fossil fuel?

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

- A: 1,000,000 years
 
- B: 100,000 years
 
- C: 10,000 years
 
- D: 1,000 years
 