All seem plausible because...
1) gain of function research is super risky and there have been lab escapes before. We need to do MUCH better about lab leaks. We should spend more on security and have greater transparency. We should also question whether it even makes sense to do that kind of research.
2) Same thing for natural research sample being leaked...
3) wet markets are probably a really bad idea. And we should probably keep a better eye on natural virus variants, HOWEVER... that's somewhat in conflict with the "maybe this research isn't worth it" line of thinking.
So we have some somewhat hard trade-offs, here, but there are aspects where we can just do better. Like, whenever we do do research on viruses, we should probably be a LOT more careful about how and when we do it.
And although it's very unlikely the virus was engineered, we should probably be careful with the technology that would let it be engineered. The technology that makes sequencing novel virus strains and developing novel vaccines using mRNA also makes it easier to engineer a virus. This is a tough one because if we had clamped down super hard on mRNA tech too early, we would've been perhaps unprepared to make a vaccine...