Answer:
Your answer would be that the adverb clause is "because all of the hens had been painted blue", the subordinating conjunction is because, and the word modified is the verb squaaked.
Explanation:
Adverb clauses, also called adverbial clauses, are dependent clauses that function as adverbs. Since they are dependent clauses, they must have a subordinating conjunction to connect them to the rest of the sentence. In this case, the subordinating conjunction is because. It introduces information regarding the reason why the red roosters squaked.
