Which detail from “Thomas Edison: The Master of Improvement” explains why Swan’s lightbulb failed to be successful?
A
“He developed and demonstrated the first small lightbulb in 1878.”B
“Its glow was produced by electricity passing through a filament, or tiny piece of material.”C
“The inside of the glass bulb was a vacuum. In other words, it was oxygen-free.”D
“[The] bulb did not glow for long, however. It produced light for only thirteen hours.”