Egyptians are credited as having pioneered embalming methods as long ago as 2650 B.C.
(A) as having
(B) with having
(C) to have
(D) as the ones who
(E) for being the ones who
Responding to a pm:
"Credit someone with something" is the correct idiom. Hence (B) is the answer.
Different people call this structure ("having done ...") different things. One of the names for it is a gerund perfect. 'having' doesn't give you the tense or the aspect of the verb i.e. it is a non-finite verb.
"pioneered" tells you that the action is already complete.
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