I believe it's B. Apologies if I'm wrong.
C. the cell membrane.
the membrane let's things in and out of the cell.
"The environmental change that occurs faster is definitely volcanic eruption. It may happen in an instant and destroy everything in its way, whereas the process of regrowth of forest after volcanic eruption is a slow one."
Link:
brainly.com/question/8822127?exp=25-1
