I would like to know why a 1 day old account is asking us to classify various business facing videos?

The first two sound native UK to me, but I'm a yank.

I can clock the third one as foreign because she overdoes our rhotic r which isn't uncommon for assiduous US-English learners.

No idea where they're all from... but I will say blended accents are so delicious to my ear; like a Korean who learned English in Texas or (much more common), a German who learned UK pronunciation.

[And, yes, I know it's bias to not hear one's native accent as an accent.]

I would not have guessed that any of these people were non-native speakers or didn’t grow up bilingual. They have an exaggerated way of speaking but without your context, I would have assumed that was because they were deliberately enunciating their words for a presentation/demonstration.

I was told once when I was learning a new language that I have a “tv” way of speaking because the only exposure I had to the language until then were courses where the instructor was speaking very clearly in a way that sounds unnatural in casual conversation :)

What for you are the giveaways that they are not native speakers?

If I only listened to the first one, that Matt guy sounded rather Dutch from his first words alone. The two ladies have artificial accents but I can't tell where they could come from.

The correct answer is:

non-Anglophone country

That takes out British, Danish, Norwegian, & German.

If they studied British, I want to say either African, or Russian. Otherwise I can't tell the accent.