Select the most appropriate option to fill in the blank.
Any resemblance of a character in this book to a living person is ______ incidental.

Correct option is C

The correct option to fill in the blank is (c) purely.
Purely means only or entirely (सिर्फ / पूरी तरह से), and is the standard adverb used in such legal disclaimers.
Example: The similarities are purely coincidental.
Other options:
· (a) absolutely – means completely, but doesn’t fit the fixed expression.
· (b) naturally – doesn’t match the context.
· (d) thoroughly – means completely or carefully, not suited here.  
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Note that:
"Purely incidental" means something that happens by chance or as a minor consequence, not intended or planned.
 Common and grammatically correct
 Widely used in both legal and general English contexts
Example: His involvement in the case was purely incidental.
"Absolutely incidental" is grammatically possible, but rare and awkward. The word absolutely emphasizes totality or certainty, which conflicts with the casual or minor nature of incidental.