The detail that supports the central idea in the image is option c: One little known invention of Edison's was the "vocal engine."
The central idea of the passage is that even though one of Edison's inventions failed, he never stopped trying out new ideas. The fact that Edison invented something called a "vocal engine" suggests that he was constantly experimenting and trying new things, even if he didn't always succeed.
The other details in the passage are either general information about Edison or information about other inventions of his.
Therefore, the detail that supports the central idea is that One little known invention of Edison's was the "vocal engine.
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QUIZ
Which of these details supports the central idea?
Central Idea: Even though one of Edison's inventions failed, he never sto trying out new ideas.
a. The phonograph and first motion picture were two of Edison's famous inventions.
b. Some of the most famous inventors failed at some point in their lives.
c.One little known invention of Edison's was the "vocal engine."
d. Edison is known as the "Wizard of Menlo Park."