The telephone was an innovation of Alexander Graham Bell. Option C is correct.
Alexander Graham Bell was a scientist, inventor, engineer, and innovator who was born is Scotland. Heinvented and patented the first practical telephone. Furthermore, he founded the American Telephone and Telegraph Company (AT&T) in 1885.
He was also noted for inventions related to optical telecommunications, hydrofoils, and aeronautics.
He had a strong influence on the National Geographic Society.