How Might the Extinction of Some Pacific Island Bats Called

How might the extinction of some Pacific Island bats called flying foxes threaten the survival of over 75% of the tree species in those islands?

A) Flying foxes protect trees from invasive herbivores.
B) Flying foxes are increasingly hunted as a luxury food.
C) Flying foxes spread disease between trees in a population.
D) Flying foxes pollinate tree flowers and disperse seeds.