I’d go with C. Jazz and the dance “The Charleston” were big and new in the 1920s.
Not A, because The Great War, World War I, ended in 1918.
Not B, because the Panama Canal was built from 1904 to 1914.
Regarding D: Telegraphs were sent from the 1840s-1977. If the question is supposed to have more than one answer, this would be a good second answer. But if the question has only one answer, go with C.
<span>Britain and France had been competing for wealth for centuries. By 1700 they were two of the strongest powers in Europe. Their long rivalry aroused bitter feelings betwen British and French colonists in North America. Also, in America, in the 1700s, both France and Britain wanted to claim the Ohio River Valley.</span>
I would say either A or D, hope I helped, sorry if I didn't!!!
Building armories because Americans invented Atomic Bomb