Which sentence is an example of informal english? a. shortwave radios are not very expensive, in part because the technology is not complicated. b. to listen to most stations on your shortwave radio, you need to have an external antenna. c. it’s hard to believe, but a shortwave radio can take you around the world for a song. d. with a shortwave radio, you can listen to hundreds of stations all over the world.

The answer is option C:

It’s hard to believe, but a shortwave radio can take you around the world for a song.

Informal English is the style in grammar, vocabulary and punctuation used in relaxed situations with people we know well. Typical informal constructions include direct speech, contractions, phrasal verbs, clichés, simpler choice of vocabulary items and extra punctuation.

i agree definitely that

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