Marcia's aunt made her throw away the ancient hairdryer because it had a two prong-plug that made it unsafe to use without an
 adaptor.
 What is the correct way to write the underlined phrase?
 OA. it had a two-prong-plug
 OB. it had a two prong plug
 OC. The phrase is correct as is.
 OD. it had a two-prong plug
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