Answer:
D. Volcanic Eruption
Explanation:
Okay, logically, if you look at the answer I've given (Volcanic Eruption) there's a clear idea that this doesn't just take time to happen. No, Volcanic Eruptions happen within a few hours, and end up with big drastic changes within that time span, which is much shorter than the other options time span of change (Tree Growth, Decomposition, Forest Succession).
I also did the test.
