Based on the sequence of events in the excerpt, which sentence best states a cause-and-effect relationship?

Because Antonio Meucci was a trained engineer, he was able to invent a “talking telegraph.”
Because electricity was used to cure sickness, Antonio Meucci invented the “talking telegraph.”
Because the device was so useful, Antonio Meucci invented the “talking telegraph.”
Because he heard a patient’s yelp through a copper wire, Antonio Meucci invented the “talking telegraph.”