Thomas Alva Edison is known for which invention?

• A. The electric light bulb; he also invented the phonograph and other devices.
• B. The telephone; he invented acoustic recording devices.
• C. The reaper; he mechanized harvesting.
• D. The cotton gin; he enhanced cotton processing.

Answer: (A)

Thomas Edison is known for making electric lighting practical and widely available, with a bulb that lasted longer thanks to improvements in the filament and an overall system to generate and distribute electricity. He also pioneered the phonograph, a device that could record and replay sound, reinforcing his impact on everyday life and future technologies. The electric light bulb and the phonograph are his most famous contributions, which is why this answer fits best. The other inventions listed are tied to different inventors—Bell for the telephone, McCormick for the reaper, and Whitney for the cotton gin—so recognizing Edison’s role in lighting and sound helps distinguish him.