Structurally and thematically, how did Bernard Shaw follow the great traditions of realism

Structurally and thematically, how did Bernard Shaw follow the great traditions of realism

A. He took the modern social issues as his subjects aiming at directing social reforms.
B. Most of his plays are concerned with political, economic, moral, or religious problems and can be termed as problem plays.
C. His plays have one passion and one only—indignation.