Which medieval composer was also a politician and author famous for his writings on music theory?
a. geoffrey chaucer
b. philippe de vitry
c. josquin des prez
d. guillame de machaut

It was "B. Philippe de Vitry" who was a Medieval composer and was also a politician and author famous for his writings on music theory, since at the time not many people knew the fundamentals of such theory. 

In the years after World War II, the United States was guided generally by containment — the policy of keeping communism from spreading beyond the countries already under its influence. The policy applied to a world divided by the Cold War, a struggle between the United States and the Soviet Union..

Explanation: