Bernard Shaw wrote quite a few history plays, in which he kept an eye on the contemporary society. The important plays of this group are（）.

Bernard Shaw wrote quite a few history plays, in which he kept an eye on the contemporary society. The important plays of this group are（）.

A.Back to Methuselah and The Apple Cart

B.Caesar and Cleopatra and St. Joan

C.Widowers' Houses and Mrs. Warren's Profession

D.Mrs. Warren' s Profession and The Apple Cart

正确答案是B