Which was not an advancement that the muslims made ?
a. they invented algebra
b. they corrected the star charts of the ancient greeks
c. they built public hospitals
d. they invented monasticism

I believe the answer is: D. They invented monasticism

Monasticism refers to the view that people should be able to  renounces all of their worldly pursuits and must devote their life solely for religious actions. This view was first introduced by the Followers of the Buddhisms followed by the christian followers

During the Cold War the United States advocated liberal democracy while the Soviet Union supported  a single-party political system.

Explanation:

The Soviet Union maintained as a form of government a one-party system, in which the Communist Party was the sole holder of public power.  According to Article 6 of the Soviet Constitution, "the leading and guiding force of Soviet society and the core of its political system, of all state and public organizations, is the Communist Party of the Soviet Union. The CPSU exists for the people and serves the people".

Due to its central role in the Constitution of the Soviet Union, the Communist Party controlled all orders of government in the USSR and tolerated no opposition.