D. That all aspects of the piece should work together to create a certain effect
To create a "unity of effect" on the reader, it should have a certain effect on the reader. Like a really sad and depressing book should not exactly make the reader sad, but to feel the parts of the book that spoke out to the reader.
Participle is a verbal form that is used as if it were an adjective or adverb.
So, if the verb is, for example, "to bark" the participle would be"barking" as in "this barking dog"
and the correct answer is b. barking!
Mature or adult would be your answer.
