Answer:
I'm not sure about it but I think it's c.
A long telegram was sent by George Kennan to the Department of State. In the telegram, he detailed his views on the Soviet Union and the US policy toward the communist state. He started it off by stating that the Soviet could not foresee a "permanent peaceful coexistence" with the West.
It’s (b) sorry for answering late
The answer is actually Complex drainage systems to keep structures from flooding.
