The Answer is the Letter D.
Expecting a situation similar to World War I, France resorted to the Maginot line to protect it from a possible German invasion.
The Maginot line was a defense barrier built along the French-German border line. It comprised heavy concrete and steel walls, mine camps, bunkers, and fortresses.
Its objective was to reinforce the defense of the border with Germany, after many historical invasions from that area. It was described at the moment as a technology marvel.
However, it failed in its strategy, since it was focused on previous technology and not on new developments. Moreover, the Germans invaded from the northern border with Belgium, sorting the Maginot line.
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<span>Great Britain is your answer!</span>
It was caused by a volcanoe
The East because they knew the secret to producing silk. A larvae spun silk. this secret gave the eastern nations serious economic power.