The Steamboat Was First Introduced ________ but Had Its Greatest

The steamboat was first introduced ________ but had its greatest impact ________.

A) from Europe; when Americans invented improvements
B) on the Hudson River; on western rivers
C) as a low-cost, democratic innovation; on the wealthy classes, who could continue to enjoy its amenities even after fares skyrocketed
D) with exaggerated claims as to its future importance; in literature rather than as an economic tool