Three pieces of evidence to support the inference are as follows;
B) They chatter in swarms over the wild-cherry trees, and overload their crops with red haws, wild plums, papaws, blackberries and mandrake.
C) The air around the wild-plum and redhaw trees is vibrant with the beating wings of millions of wild bees, and the bee-birds feast to gluttony.
D) Wild creepers flaunt their red and gold from the treetops, and the bumblebees and humming-birds make common cause in rifling the honey-laden trumpets.
What are the pieces of evidence?
This first option directly describes the abundance of food available for the birds, with various fruits and berries in excess. The birds' activity, swarming and feasting, further emphasizes the plentiful resources.
This second option highlights the bustling activity of insects, again pointing to the ecosystem's richness. Millions of bees buzzing around fruit trees suggests a thriving pollinator population, further contributing to the ecosystem's health. This third option showcases the diverse interactions between different species.