Elif: I'm doing a science project on famous inventors. I need to find who invented the first practical light bulb.
Mert: That was Thomas Edison in 1879. He developed a long-lasting bulb.
Elif: Thanks! Also, I read that Edison invented the phonograph. What is that?
Mert: It's a device that records and plays back sound. He invented it in 1877.
Which of the following questions does **NOT** have an answer in the conversation?
A)Who invented the first practical light bulb?
B)When did Edison invent the phonograph?
C)What is the phonograph?
D)How many inventions did Edison make?
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