As a realist dramatist， George Bernard Shaw is concerned with social. economic， moral and religious problems in his works. The general mood he expressed in his plays is（）.

As a realist dramatist， George Bernard Shaw is concerned with social. economic， moral and religious problems in his works. The general mood he expressed in his plays is（）.
A、indignation
B、satisfaction
C、optimism
D、pessimism
正确答案：A