Answer:
The choice that combines the sentences using an appositive is B.
Step-by-step explanation:
An appositive is a noun or noun phrase that renames another noun right beside it. In this case, the appositive phrase is the NP "the Bullet Train and the Train a Grande Vitesse."
Nonessential appositives are always separated from the rest of the sentence with commas because the information they provide is not necessary to complete the sentence. If dropped, the meaning of the sentence would be left unchanged (see 1).
1) Two famous high-speed trains can go 186 miles per hour.