As a noun, "radio" refers to an electronic device used for transmitting or receiving radio signals, often for entertainment, communication, or broadcasting purposes. As a verb, "radio" means to communicate or transmit messages using radio waves or radio technology.
In statement I, "radio" is used correctly as a noun, referring to an electronic device used for receiving radio signals.
In statement II, "radioed" is used correctly as a verb, indicating the action of communicating via radio for backup.
In statement III, "radio" is not used correctly. The statement intends to convey that the subject narrowly avoided or managed to get away from serious injury. 'Radio' does not fit the context of the sentence. 'Escape' would be more appropriate for this context. Hence, (b) is the correct answer.
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