Question

if it were not for this innovator, we would not be able to communicate with one another via phone.
○ nikolaus otto
○ alexander graham bell
○ kelly bessemer
○ andrew carnegie

Explanation:

Nikolaus Otto is known for the internal combustion engine. Kelly Bessemer (Henry Bessemer is the correct name) for the Bessemer process in steelmaking. Andrew Carnegie was a steel industrialist. Alexander Graham Bell invented the telephone, enabling phone communication.

Answer:

B. Alexander Graham Bell