PLEASE HELP Identify the sentence that uses correct punctuation.
a. We had to walk, all the way to the train station, the bus doesn't go that far.
b. We had to walk; all the way to the train station, the bus doesn't go that far.
c. We had to walk all the way to the train station; the bus doesn't go that far.
d. We had to walk all the way to the train station, the bus doesn't go that far.