Final answer:
Community 2 (Option A) would be more susceptible to disease in tree species A due to the change in pollinators.
Step-by-step explanation:
The answer is Community 2 (Option A).
In the provided information, it states that new or different species of insects are going to pollinate the flowering plants. This change in pollinators can increase the risk of disease transmission in tree species A, as different insects may not have developed resistance to the disease-causing pathogens present in tree species A.
Therefore, Community 2 would be more susceptible to disease in tree species A compared to Community 1 or when compared to a scenario where neither community is impacted by disease.