Question

Which of the following could result in secondary succession?
A. the formation of a tall sand dune on a previously grassy beach
B. a vast glacier in motion forming a U-shaped valley on its wake
C. a volcanic eruption that covers most of what used to be a forest
D. an introduced species that devastates native plants as it feeds

Answer 1

C is automatically wrong.
I doubt B is correct
A is like weird.
Id say D.

Answer 2

thank you