Which One of the Following Instructions Is Most Likely to Encourage

Which one of the following instructions is most likely to encourage students to elaborate as they study new material about the transcontinental railroad? Ask them

A) to find Ogden, Utah, site of the golden spike, on the map.
B) which Native American tribes lived along the railroad route.
C) what was the chief crop of Nebraska.
D) how the transcontinental railroad might have affected the economy of Utah.