implict v.s unequivocal v.s overt

IMPLICIT
A. unadulaterated
B. overt
C. abstract
D. unequivocal
E. germane

(Choose a lettered word that is most nearly opposite in meaning to the word in the capital letters.)

I was caught in dilemma whether to choose A or B. Thank you.

Should be B. "Implicit" is the antonym of "explicit". And "overt" is a synonym of "explicit". 

Pieanne wrote:

"Covert" means "implied", which is the total antonym of "implicit".

Pieanne, did you also make a flub here?--  Implied is an antonym of implicit?

Here's the corrected version of my earlier post ( which I've since deleted  because it was so misleading due to the missing word):

In addition, Jeff--  implicit does not have a  synonym in ambiguous.  Something expressed indirectly is not the same as something expressed ambiguously.  Directness/indirectness should not be equated to clarity/ambiguity.

To quote a well-known  ambiguity in a direct expression:  'I saw the man on a hill with a telescope.'  (Credit to a recent post by CJ.)