Playwrights who experimented with adding thoughts and feelings to realistic drama in the 1920s and 1930s included george orwell eugene o’neill tennessee williams both b and c

The correct answer is the option D: both B and C

Explanation:

On one hand, Eugene O'Neill was an american playwright whose plays were among the first ones who introduce the techniques of realism into the U.S. drama during the early twentieth century.

On the other hand, Tennessee Williams was also an american playwright who alongside with O'Neill were the foremost contemporary playwrighters of the twentieth century American drama.  

Their famous work where there are examples of the use of thoughts and feelings to the style of the drama are the ''Long Day's Journey into Night'' by O'Neill and ''A Streetcar Named Desire'' by Williams.