The best and most correct answer among the choices provided by your question is the first choice or letter A. The <span>underlined adjective could also function as a verb is the word "gleaming."
The word modifies the feathers, but it could also function as a gerund.</span>
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The answer to this question is B
Being free and able to do anything
It would be a subordinate cause, for it can't stand on its own. Think about it: Since early this morning. What happened since early morning? Since it doesn't provide that information, it wouldn't be able to be an independent cause.
Also, I don't believe that the sentence is grammatically correct :)
