Answer:
the aswer is A and E<em> </em><u>i think</u>
Explanation:
Ibsen's Hedda Gabler can best be categorized as a problem play.
The organizing principles that are used in this paragraph are comparison and contrast; cause and effect. In the beginning, the author is giving the similarities and the differences between petroleum and coal, and moves on to talk about cause and effect in the end.
