Which logical fallacy is used in the text?
Ava said there's no way Scotland's Loch Ness Monster is real, but she's not even Scottish, so there's no way she could really know.

 - straw man: a misrepresentation of an opponent's position that makes it easier to argue against
 - false dichotomy: an argument that presents only two choices when more options exist
 - ad hominem: an attack against the person making the argument, rather than the argument itself
The text argues that Ava's claim that the Loch Ness Monster isn't real is not valid because she's not Scottish. This is a personal attack on Ava's background that isn't relevant to whether her claim is valid. This illustrates a type of logical fallacy known as ad hominem.