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OpenStudy (anonymous):

What more recent events/inventions made the original "hotline" obsolete? Select one: a. Cell-phone Technology in 1990s b. Sputnik's launch in the 1960s c. Fall of the Soviet Union in the 1980s d. Development of fiber optics in the 1980s

OpenStudy (anonymous):

It should be A but not sure.

OpenStudy (jareeek):

im going to agree

OpenStudy (anonymous):

A

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