Guided by the principle of adhering to the truthful treatment of life, the American（）introduced industrial workers and farmers, ambitious businessmen and vagrants, prostitutes and unheroic soldiers as major characters in fiction.

Guided by the principle of adhering to the truthful treatment of life, the American（）introduced industrial workers and farmers, ambitious businessmen and vagrants, prostitutes and unheroic soldiers as major characters in fiction.

A.romanticists

B.modernists

C.psychologists

D.realists

正确答案是D