In your opinion who was the most influential inventor of the 19th century?

Englishman John Mercer because he invented a process to increase the tensile strength and affinity for dyes in cotton thread.

Explanation:

Nikola Tesla

Explanation:

The easy answer would be Thomas Edison, but what some people don't know is that he stole his inventions from other people. And if you were to do the research or maybe you had a decent teacher who taught you this, you would know that the sole victim of Thomas Edison's thievery was Nika Tesla. And unfortunately, Edison wasn't the only man to steal Tesla's ideas. Guglielmo Marconi(pronounced goon-yer-mo & translated as William) was also a part of the stealing Tesla's inventions club. The radio was big deal when Marconi came out with it.

just like you man, i personally think its either c or d

explanation:

but good luck with the test man