Final answer:
The subject of this question is Spanish. The correct answer is 'mejor', which means 'best'.
Step-by-step explanation:
The subject of this question is Spanish.
The correct answer is option C. mejor. In the sentence, the speaker is praising the restaurant, so they are saying that it is the best restaurant in the city.
For example, if the sentence said 'Este restaurante es terrible', the correct option would be 'peor', which means 'worst'.
Learn more about Spanish grammar: comparatives