Which invention is Thomas Edison best known for?

• A. Phonograph
• B. Motion pictures
• C. Electric light bulb
• D. Telephone

Answer: (C)

The key idea here is recognizing which invention shaped everyday life and industry the most due to its broad impact. Thomas Edison is best known for the electric light bulb because his work made a practical, long-lasting bulb and, crucially, he built a complete electric lighting system—generators, wiring, and distribution—that could bring electric light into homes, streets, and factories. This combination transformed daily life and commerce far more widely than his other projects, even though he did contribute to inventions like the phonograph and early motion pictures. The telephone, meanwhile, is associated with Bell, not Edison.