According to the passage, what did David Sarnoff predict about radios？A．They would get sma

According to the passage, what did David Sarnoff predict about radios？

A．They would get smaller in size.

B．Their signals would travel further.

C．They would become less popular than television.

D．They would be common household items.

请帮忙给出正确答案和分析，谢谢！

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