Which of these details does NOT support the central
idea?
Central Idea: Even though one of Edison's inventions failed, he never stopped
trying out new ideas.
A) The vocal engine was a cumbersome device for the
user.
B) Edison created a version of the light bulb that
was affordable and long-lasting.
C) Sound waves are not powerful enough to make the
vocal engine useful.
D) The vocal engine had a few fatal flaws.