Final answer:
The sentence '¿Qué hay?' is grammatically correct and translates to 'What's up?' in English.
Step-by-step explanation:
Out of the given options, the sentence '¿Qué hay?' is grammatically correct. The sentence translates to 'What's up?' in English and is used to greet someone or to ask how they are doing. It is a common phrase used in casual conversations.
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