Which one of the following statements is true of Dickinson’s “I

Which one of the following statements is true of Dickinson’s “I like to see it lap the Miles”?
A、This poem describes a mare dancing at midnight.
B、This poem describes a horse galloping through valleys.
C、This poem describes a train running through the mountainous area.
D、This poem describes a traveler’s joyous journey through the scenic mountainous area.
【正确答案】：C