Sentence Correction

Many scholars regard the pre-Hispanic civilizations of Peru as the most impressive in South America.
(A) regard the pre-Hispanic civilizations of Peru as
(B) regard the pre-Hispanic civilizations of Peru to be
(C) regard the pre-Hispanic civilizations of Peru to have been
(D) consider that the pre-Hispanic civilizations of Peru are
(E) consider the pre-Hispanic civilizations of Peru as

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The given sentence is fine. Regard... as is the correct usage.