In the Early Eighteenth Century,the Americans Robert Fulton and Robert

In the early eighteenth century,the Americans Robert Fulton and Robert Livingston

A) invented the steam engine.
B) made significant advances in steam-powered navigation.
C) developed the nation's first merchant marine.
D) brought the first steam engines from England to the United States.
E) launched America's first railroad engine, the Clermont, in 1807.