Final answer:
The correct completion of the sentence is 'Este restaurante tiene, a menú porque todo es carísimo.' It means 'This restaurant has an extremely expensive menu because everything is very expensive.'
Step-by-step explanation:
The correct option to complete the sentence is A. Este fin de semana, celebraremos mi cumpleaños en mi restaurante favorito. Este restaurante tiene, a menú porque todo es carísimo.
The sentence is saying that the restaurant has an extremely expensive menu because everything is very expensive. The adjective carísimo means extremely expensive in Spanish.
So, the correct completion of the sentence is Este restaurante tiene, a menú porque todo es carísimo.
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