This type of text tells a story and generally uses a lot of emotion
The independent clause in the sentence is "we returned it." This is the answer because if you say the sentence alone it makes since and it does not need another sentence to support it. Furthermore, the dependent clause in that sentence is "Because the shirt had a tear,". This does not express a reasoning for the shirt having a tear. But, "we returned it", has a subject and a verb. "we" is the subject, and the action of returning is the verb. I hope this has been helpful. : )
The answer is B, because if it says that "Martin luther king voice had a strong power over the audience" that obviously means he was speaking and a very dominant tone which means all eyes and ears where peered upon him.