Here's a problem to solve: Deer are introduced into a grassland ecosystem and their population increases considerably. If the deer population continues to grow, which is the most likely outcome for the ecosystem?

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

- A: Biodiversity would decrease, and sustainability would decrease.
 
- B: Biodiversity would decrease, and sustainability would increase.
 
- C: Biodiversity would increase, and sustainability would increase.
 
- D: Biodiversity would increase, and sustainability would decrease.
 