Answer:
C. To entertain.
Explanation:
In her novel "A Tree Grows In Brooklyn", Betty Smith talks of the perseverance and persistence of the "Tree of Heaven" grew and sustained itself amidst the tenement houses. Written as a semi-autobiographical form of novel, Smith talks of the positivity of life despite all odds.
The primary objective of writing this story was to entertain and a form of indulging herself in her writing, away from her own reality. She did not expect the massive feedback and popularity of the book. It was even published as the Armed Services Edition, made into pocket-sized books so that military men could have access to it. Her stories of perseverance and positivity, the allusion to the "Tree of Heaven" as something to look forward to, a symbol of determination and hope, resonates with the men in military positions.
