english question…………………………………………

english question…………………………………………

Which option best identifies a restrictive clause?
 
1. Animals that are well behaved are welcome at the pedestrian mall.
 2.On our way to the airport, which is east of the city, we found that our flight was delayed.
 3.After we arrived at the hotel, which was sixty-four miles away, we discovered we had forgotten our luggage.
 4.The dog, which was digging in the backyard, was punished.