The Modern Era is known for its rejection of social values. Option A is correct.
The era of Modernism took place in the early 20th century. At that timeperiod, people desired to get rid of all those values and principles from the past and adopt and embrace new ones.
Modernism consisted of a philosophical movement that, together with cultural trends as well as changes, stemmed from wide-scale and far-reaching changes in Western society during the late 19th and early 20th centuries.