The correct answer is letter C.
Explanation: Liberal economist Friedrich Hayek, identified in early 1929 that the economic boom would end. And it was right. The result of this state intervention in the economy was the crash of the New York Stock Exchange in October 1929, which, until today, is mentioned by the enemies of liberty as the fault of "capitalism."
The best explanation why the area between Spain and Gaul was not part of the Roman empire until that later period was a culmination from both undesireability and difficulty in accessing this region due to its mountaineous nature. So I would wager the answer being both C and D - undesireability and difficulty in access.
Answer: C
Explanation: Hope I helped.
The United States was willing to pay more per mile for the Gadsden Purchase than for the Mexican Cession because the Gadsden Purchase gave money to the United States to build a railroad.