If the F₂ generation illustrates a lack of fitness, what is this an example of?

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Hybrid breakdown is the gradual decrease in fitness seen in the offspring of two different species that have interbred. This often occurs due to genetic incompatibilities between the two species' genomes. The F₂ generation is an example of hybrid breakdown as its fitness is reduced compared to the parent species. A and B refer to types of reproductive isolation, while D refers to a specific type of hybrid breakdown where the hybrid offspring are sterile.

If the F2 Generation Illustrates a Lack of Fitness, What

If the F₂ Generation Illustrates a Lack of Fitness, What