Don't Fold [DAT PAT Pattern Folding]

I am not a DAT TH-camr.
CORRECTIONS
At 19:00 I talk about the square with the grey triangle to "the right" of the square with the grey quarter, but I meant to look at the other square with the grey triangle that is adjacent to it. This is because in the orientation of answer choice B, the square with the grey triangle slightly above the square of reference with the grey quarter would actually be to the right of that square with the grey quarter. This would result in a full-length white side connected to the side with the grey quarter, which is still incorrect anyways.
At 25:00 I draw what orientation the 3-side should look like in order for answer choice C to be correct, but in reality, C would still not be correct even with that orientation change because in that specific orientation of 3, with 1 being on top of 3, 4 would be to the right, not 5. The issue was not orientation for answer choice C on that question, it was connectivity.