I think it is B. Every plot should have a conflict, rising action, and climax.
On June 5, 1956, the District Court ruled 2-1, with Lynne dissenting, that bus segregation is unconstitutional under the Equal Protection Clause of the 14th Amendment to the U.S. Constitution. The state and city appealed, and the decision was summarily affirmed by the United States Supreme Court on November 13, 1956.
The rat is "trapped." This is symbolic of how the social and material conditions configure the lives of many children of color. Travis is chasing the rat with his friends, which is symbolic of the of forces that are "chasing" and seeking to "trap" children of color in America.