The answer is B. Given this.
Signal words (also called transitions) help connect ideas inside the structure of a text. There are many types of signal words, for instance: comparison words, contrast words, emphasis words and so on.
In the excerpt asked about, we have the expression "given this", which connects the idea that is about to be developed with the ideas and arguments that have already been pointed out in the previous paragraphs. This is expression signals a relationship of cause and effect. Given ... circumstances, we have... results.
It worked to change white citizens' perceptions of African Americans an opportunity to create a new identity by using art to express their feelings and experiences.
The correct answer is C. before the conjunction.
If there is a conjunction between two independent clauses, then the comma will be placed in front of it. For example: <em>We had a lot of fun at the beach, but I feel tired now. </em>
As you can see, the comma is located in front of the conjunction <em>but. </em>Simply placing a comma between the sentences (without a conjunction) creates a run-on sentence, and that is grammatically incorrect.
I would say b. Time, d. Location, and f. Atmosphere.