3. When the author of the passage describes the Incan civilization as the "greatest empire on earth," he means that they
(A) constructed great buildings and other structures
(B) conquered other empires, including the Aztecs
(C) adapted successfully to diverse environments
(D) were the wealthiest civilization in the world in 1491

How did the construction of the erie canal improve transportation in the united states in the 1820s? a. the canal connected the great lakes to the mississippi river. b. the canal connected the great lakes to the ohio river. c. the canal connected the atlantic and pacific oceans. d. the canal connected the great lakes to the atlantic ocean.