Although Artists in Different Countries Developed Their Own Approach to Realism,what

Although artists in different countries developed their own approach to Realism,what common interest united them?

A) a rejection of Academic standards for artistic styles and patronage
B) a desire to present an unflinching look at the lives of the working poor
C) a preference for oil painting and symmetrically balanced compositions
D) their political and religious affiliation and activist role in society