Agent Scully, shockingly, does not like either of these explanations; she frowns, deep in thought as she climbs back into the car. She doesn't want to point out that nothing happened, because obviously something happened; but nothing that seems indicative of alien abduction. They're still firmly on Earth.

"I understand that you try to stay open to.... extreme possibilities." And she's trying not to hold that against him, though she's polite enough not to say so. "But it seems like there are still a number of more mundane possibilities you're skipping over, here."