If one of the answers is machines then that is the answer
Correct answer is:
d) Detente
Detente is that the easing of strained relations, particularly during a political scenario. within the context of the cold war, the drop-off of tensions between the East and West, in conjunction with domestic reform within the Union of Soviet Socialist Republics, worked along to realize the tip of communism in eastern Europe and eventually the Union of Soviet Socialist Republics altogether.
The declare independence from Great Britain
The significant advantage possessed by the Union at the beginning of the Civil War is a larger free population. They also have created big factories that can produce military supplies and ammunition. They have access to railways. This made transportation of men and supplies easier.
Srry, but the answer is false. Decibel is measurement of the intensity of sound.