Subordinate.
"Once you finish your work" by itself is not a sentence, therefore it depends on the remaining.
I haven't read that book in a while, I think the climax was when Jack punched Julian???
On is the only preposition in this sentence. A preposition shows location, such as, on, over, beside, etc.
<em>I </em><em>think</em><em> it's</em><em> </em><em>options</em><em> </em><em>(</em><em>b)</em><em> </em>
<em> </em><em>hope </em><em>is </em><em>the </em><em>correct</em><em> answer</em>
<span>B.
That is the silliest puppy I’ve ever met.</span>
