Answer:
C). You can choose to be happy—no matter what life throws at you.
Explanation:
'Roll of Thunder, Hear My Cry' by Mildred D. Taylor throws light upon the social issues of racism and poverty in America during the time of the Jim Crow and the Great Depression.
As per the question, the statement that best describes a developing theme in the novel is 'You can choose to be happy—no matter what life throws at you' which is reflected through Cassie Logan's choice of accepting the things 'the way it was' irrespective of the discrimination and injustices that were done to her by the whites. Thus, option C is the correct answer.