It's simple, the answer is 'a'.
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OK so Charybdis is a Whirlpool it was originally considered a sea monster so the best option to go with will be option D.
The correct option is A.
In the passage given above, it can be seen that Dallow as the defence lawyer of these boys exaggerated and blamed all the circumstances surrounding the boys for their crime in order to manipulate the audience to believe that the situations surrounding them is the reason they behaved the way they did, otherwise they are normal children