Absurdly ridiculous.....................................................................................................................
The first I'd say is manly, and the second I'd say foolishness.
The sentence whose style is most appropriate with respect to clarity and simplicity of language is the first one - For centuries, art admirers have been digging through records of the painting to figure out its meaning.
The other sentences use language that is quite complicated.
C, the predicate adjective is used to describe the subject, in the predicate.
