GMAT Critical Reasoning (CR) | Re: In the United States, of the people who moved from one state

What is they say for option (E). Just curious to know.

Does it Strengthen the argument?

I think it strengthens since if the retirees leaving Florida for another state are more then the economy related to them would be affected.

OG/OE says:

This makes it more likely that Florida's economy will be harmed because of decreasing numbers of
retirees, but has no real bearing on the argument which concludes specifically that declines in the
proportion of emigrating retirees moving to Florida will
...

---