Office of strategic service (OSS) was the old name of which Intelligence agency?

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Office of strategic service (OSS) was the old name of which Intelligence agency?A. MI6
B. CIA
C. ISI
D. N.O.T

Some 13,000 men and women worked for the Office of Strategic Services (OSS), the U.S. intelligence agency during World War II and the forerunner of the modern CIA.