Which Statement Best Describes the Relationship Between Steamboats, Keelboats and Flatboats

Which statement best describes the relationship between steamboats, keelboats and flatboats on the Mississippi River in the antebellum period?

A) Steamboats were substitutes for both keelboats and flatboats.
B) Steamboats were complements for both keelboats and flatboats.
C) Steamboats were substitutes for keelboats and complements for flatboats.
D) Steamboats were substitutes for flatboats and complements for keelboats.

Correct Answer:

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