Choose the correct option to fill in the blank : You are ............ among criminals.

Right Answer: meanest

When a person or thing is compared with the whole group to which it belongs, English uses the superlative degree, and the preposition 'among' or 'of' introduces that group. Here the speaker is placed within the group of criminals, so the superlative form 'meanest' is required. The comparative 'meaner' would need 'than' and only two items, 'meanly' is an adverb and cannot follow the verb 'are' as a complement, and 'most meaner' is a double comparative, which is grammatically wrong. Hence the correct answer is 'meanest'.