单项选择题
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