I think it is behavioral isolation. Performing a mating dance wouldn't be abnormal behavior on its own, but the key takeaway from the question is that the meaning of this behavior is indecipherable to other members of the species. Without being able to communicate their desire to mate, the individual will fail to reproduce and this new dance won't be passed on to the next generation.

The motion of the dance would carry no meaning to others of the same species, and this individual will be isolated by that behavior as a result.

It's Postzygotic. Covers all of human behavior from embryo to adult.

I will copy your answer.

I'd guess it's behavioral isolation because your behaviors caused the isolation? I'm guessing this is bio?

I think there are more options listed that aren't in the pic

It's temporal isolation. By removing themselves from the social scene and failing to find a mate, they remove themselves from the timeline.

YOU are CHOOSING to isolate yourself. This has to be behavioral, right?

CS101