A is the answer I have read the story but I don't remember that much
Some themes for this could be a cliche like "All life is precious" and if you watch "The Walking Dead" on AMC, you know Morgan the actor refuses to kill humans because he believes they can change to good people. Another theme could be "All things deserve life"
it is true i think because i dont know the answer so i just guessed
It would be Nemo because that's who Dory is giving the leaf, or the direct object, to. You can think of it as the indirect object bouncing back from the direct object.