A Rainforest Is a Highly Complex Habitat, with Organisms Living

A rainforest is a highly complex habitat, with organisms living at various levels in the trees, on the ground, and underground. Is it possible to consider two populations living in the same tree to be geographically isolated?

A) No, because if they are in the same tree, they are in the same geographic area.
B) No, because if they are in the same square acre, they cannot be considered to be geographically isolated.
C) Yes, because they can still undergo sympatric speciation.
D) Yes, because there are so many habitats in one tree that the populations may never interact.