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Arguably one of the most important inventions of the 20th century was A) the transistor. B) air conditioning. C) the vacuum cleaner. D) radio broadcasting.
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Arguably one of the most important inventions of the 20th century was A) the transistor. B) air conditioning. C) the vacuum cleaner. D) radio broadcasting.

User DrDamnit
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Answer:

A. The transistor :)

Step-by-step explanation:

User Hynekcer
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