What is the advantage of these different feeding niches for the birds? A
less competition for food
B
fewer abiotic resources for each bird species
с
fewer biotic resources for each bird species
D
less energy available as the birds feed higher in the tree

it's D

Explanation: As more birds feed higher in the tree, available energy increases. More abiotic resources are available for each bird. Predators are less likely to feed on birds in a variety of locations.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.

thats not a question