In the late 1800s, the increase of service industry workers led to the rise of the
lower class.

middle class.

upper class.

socioeconomic class

   Middle class

Explanation:  In the late 1800's, which is the period of the Second Industrial Revolution or the so-called Technological Revolution, which lasted until the beginning of the WWI, that is, about 1914, when many technological innovations contributed to faster transport of goods, faster telecommunications, using artificial lighting and improving working conditions. These are innovations in the form of telegraph improvement, the development of railroads and rail transport networks, the emergence of the use of electrical energy for lighting and the possibility of working at night, etc. All this contributed to better working conditions, better management, the ability to organize workers into trade unions, reduce working hours, and better pay especially for skilled workers. Over time skilled workers began to live better with higher wages and in better environments with better living conditions that led to the emergence of a middle class.

answer:    

a.

explanation:

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.