For Insects,could There Be a Connection Between Being the First

For insects,could there be a connection between being the first organism to fly and being the most diverse terrestrial organism today?

A) Probably not; terrestrial insects are only so diverse because they have been around so much longer than other animals and have, therefore, had more time to evolve.
B) Yes; the ability to fly between populations decreases gene flow, resulting in rapid speciation.
C) No; only environmental changes can lead to adaptive radiation of a group as large as insects.
D) Maybe; because insects were the first in the air, they had a variety of habitats to explore without competition, which often leads to adaptive radiation.