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
Between option (A) & (D) ??