The sentence that can be removed <u>without affecting the explanation</u> is "<em>In the 1800s, the United States was still a very young nation, trying to solidify its identity</em>."
The reason this sentence can be removed is that it does not offer any necessary information to the explanation. The passage is about how technology leads to bigger cities. This information is conveyed just as efficiently without the need for the first sentence. 
Rather than serving to offer information, the first sentence in the passage serves as a sort of <u>introduction</u> to the text. The very next sentence can just as easily serve as an intro to the passage while providing context for the development of early technology that led to the industrial revolution. 
For these reasons, the sentence "<em>In the 1800s, the United States was still a very young nation, trying to solidify its identity</em>." can easily be removed from the passage <u>without affecting</u> the explanation. 
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I feel like agree with (B) much more because in the question it states that the quote has to show the "cultural complexity" of the genre meaning that its not as static as it was before as mentioned in question A. , but how it evolved over-time thus becoming more complex : branching out into different ideas of race and class . 
 
        
             
        
        
        
Baba abdullah's real name is Lawrence Robert Shreve. He was a professional wrestler known for being in some of the bloodiest fights of all time.
-Steel jelly