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.
My family is kind of annoying sometimes. My 7 year old brother is OBSESSED with cars. HE has a crush on our next door neighbour. My mom is sort of a well known singer. My dad's VERY strict. And then there's our dog, Maxie. She's a pomeranian pooch.
A tree is given symbolic meaning the the one that best describes the use of poetic elements in the excerpt
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it's (A) , i think it's the best description for this context .