Final answer:
The correct word to complete the sentence is 'Qué', which means 'What'. It is crucial in forming meaningful questions in Spanish.
Explanation:
Qué es el vestido de tu celebración de cumpleaños? -El vestido es rosado y bonito.
In this sentence, the correct word to complete the question is Qué which means 'What' in English. It is used to ask about the nature or identity of something.
When forming questions in Spanish, it is essential to pay attention to the appropriate context and choose the right interrogative word to elicit the desired information.
Learn more about Spanish language interrogatives here:
https://brainly.com/question/38498699
