1Last week I went to an Italian and a Vietnamese restaurant. 2Both had excellent food; however, the service was another story. 3There was a long wait in the Italian restaurant, and the server was rude, while in the Vietnamese restaurant I was seated immediately, and the server was polite and attentive. 4How I was treated made such a difference in my opinion of both restaurants.
Which numbered sentence is the topic sentence?

Question

1Last week I went to an Italian and a Vietnamese restaurant. 2Both had excellent food; however, the service was another story. 3There was a long wait in the Italian restaurant, and the server was rude, while in the Vietnamese restaurant I was seated immediately, and the server was polite and attentive. 4How I was treated made such a difference in my opinion of both restaurants.
Which numbered sentence is the topic sentence?