The correct answer is A. rejection of social values.
The era of Modernism brought a change because people then wanted to lead completely different lives than people in the previous eras. Therefore, they wanted to do away with principles and values of the past, and create some of their own, which greatly differed from those before them. Modernism took place in early 20th century.
The modernist movement was based on the idea that the "traditional" forms of the plastic arts, literature, design, social organization and daily life became outdated and that it was essential to leave them aside and create a new through social change. This finding supported the idea of reexamining every aspect of existence, from commerce to philosophy, with the aim of finding what would be the "old marks" and replacing them with new, and possibly better, forms of "progress." In essence, the modern movement argued that the new realities of the twentieth century were permanent and eminent, and that people should adapt to their world views in order to accept that what was new was also good and beautiful.