Sentence 1 and 4 are the correct answers because they are using the adjective ''attributable'' correctly since the meaning of it is explaining a cause of something.
In the first sentence, we have an explanation of why there are structural flaws and it is because of the bridge collapse. So engineers attributed the bridge collapse to those flaws who are bad.
In the fourth sentence, Miguel is explaining that his fear of heights is caused by his dreams where he was falling. He attributes that fear to his dreams.
The other two sentences, 2 and 3, are not using this word as it should and they are incorrect.
