The correct option is
C Confused
The word 'lucidity' refers to the clarity in expression.
Option A, confused refers to the inability to think clearly.
Option B, sober refers to being serious, sensible and solemn.
Option C, simple refers to being easily understood or done and presenting no difficulty.
Option D, verbose refers to using or expressing in more words than are needed.
Thus, according to the meaning, the word 'confused' is the most different in meaning from the word 'lucidity'.