Pretty sure it's 2 because the words Congress and Avenue should be capitalised.
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.
This is the "bob and wheel" pattern.
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.
