Here is one option:
His and Susie's neighbors were standing behind them in the long line at the seafood restaurant
The dependent clause is the one that can stand by itself. It must have a subject and predicate. "Because he's so good at playing piano" does have a subject and a predicate, but when you put the word 'because' at the beginning, which is a subordinating conjunction, it is not a dependent clause. Therefore, the answer is D, Steven was asked to play at the concert next month.
Leap into maturity.......
At the beginning of this excerpt, we see the narrator (Theodore Dreiser) reflecting on the nature of his brother. The excerpt then switches to the narrative storytelling of an event that clarifies and supports this reflection. Because this is a work of nonfiction and Dreiser is recounting real people and their experiences, he makes it known that it’s almost impossible to use words to capture the essence of what his brother was truly like. He proceeds to narrate an incident that helps the readers get a better understanding of his brother and his nature. Dreiser describes the incident as though he is telling a fictional story. He provides descriptive details about the atmosphere and the character (his brother) in the scene, just like a scene from a piece of fiction. He draws on his factual knowledge of his brother’s traits and uses this brief, real-life incident to help readers understand his brother and how he was generous, sympathetic, and a tad bit mischievous. He uses descriptive language to add depth to the incident and maintain readers’ attention.