Which answer choice combines the sentences using an appositive? two famous high-speed trains are the bullet train and the train à grande vitesse. both can go 186 miles per hour. a. two famous high-speed trains are the bullet train and the train à grande vitesse, and both can go 186 miles per hour. b. two famous high-speed trains, the bullet train and the train à grande vitesse, can go 186 miles per hour. c. two famous high-speed trains, going 186 miles per hour, are the bullet train and the train à grande vitesse. d. going 186 miles per hour, the most famous high-speed trains are the bullet train and the train à grande vitesse.