Answer:
B
Step-by-step explanation:
all other answers are temporary and ineffective to case any serious change long term.
A is seasonal meaning it comes and going in short species are adapted to it
C is just like A they'll come back once the mating process is over
D it's just a path it doesn't upset the ecosystem to a large degree. trees won't be cut down and a minimum as possible vegetation will be cut down.
B will case a great shift in the ecosystem because the invading plant will occupy all resources and all materials required for other plants to thrive therefore killing them. this will cause primary consumers to reduce in population and we know where that ends