Leonardo da Vinci is an enigmatic individual. In other words, He is really.

Directions: Each of the following analogy questions presents a related pair of words linked by a colon. Five lettered pairs of words follow the linked pair. Choose the lettered pair of words whose relationship is most like the relationship expressed in the original linked pair. HELPFUL : OFFICIOUS ::（） A: dutiful: assiduous B: effusive : gushing C: gullible :incredulous D: enigmatic : dumbfounded E: deferential : sycophantic