Teacher:In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
Teacher: Now, understand the problem? Solve this instance: Sentence: By train of the following is the most efficient way to transport large amounts of coal from a mine in kentucky to a power plant in arizona. Question: Which of the following is the most efficient way to transport large amounts of coal from a mine in Kentucky to a power plant in Arizona?
Student:
by train