Some beetles and flies have antler-like structures on their heads, much like male deer. the existence of antlers in beetle, fly, and deer species with strong male-male competition is an example of ) homology b) similarity due to shared ancestry c) parsimony d) convergent evolution
The correct answer is D) Convergent evolution.
Even though between flies and beetles it could be considered as a homology, between such insects and deers it's absolutely a convergence. Homologies are comparable characters between taxons that could have evolved from a common ancestor that had these structures. The common ancestor between insects and deers is really far in the phylogeny so the structure is not comparable.