Answer: The main idea of this passage is that fictional can be real but many people don't know it or can't explain it at all. Just like the dragons they come from many different sources.
Explanation: Things that humans can't understand are usally called fictional. fiction is something that is made up and it's too impossible to believe in the first place. all in all the main idea of this passage is to explain from many sources that the myth of these mythical flying creatures might actually be real. :}
The difference between an universal theme and a common theme is that an universal theme can be implemented or used by anyone and a common theme is a message of a passage.
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Skulk in other words is like saying dodge, hide, sneak, or avoid, there are many words that can mean skulk but th best one is hide because the meaning of skulk is keep on hididng
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I am pretty sure it is option "A."
Diligence by definition means to "careful and persistent work or effort"
So yeah the answer is A.
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