Which of the following innovators was most responsible for making the united states a world economic power?
a.
guglielmo marconi
b.
samuel morse
c.
heinrich hertz
d.
andrew carnegie
is it b?

First, Heinrich Hertz was German and Guigiermo Marconi was Italian - they were not Americans, so we can reject those options. Samuel Morse did important contributions to communications, but the best answer is Andrew Carnegie - Carnegie was a successful industrialist and he also directly supported American Industry, he himself was very rich but he also generously donated to charities.