GMAT Critical Reasoning (CR) | Re: Lou observes that if flight 409 is canceled

Lou observes that if flight 409 is canceled, then the manager could not possibly arrive in time for the meeting. But theflight was not canceled. Therefore, Lou concludes, the manager will certainly be on time. Evelyn replies that even if Lou's premises are true, his argument is fallacious. And therefore, sheadds, the manager will not arrive on time after all.
Which of the following is the strongest thing that we can properly say about this discussion?

A) Evelyn is mistaken in thinking Lou's