Answer: Option A, "It creates an air of suspense in the plot".
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It is the '<span>Two men argue about whose football team is better.</span>' Because you can see that two characters are arguing about what football team is better.
An adverb clause is a dependent clause which cannot exist on its own, it has to be a part of the main, independent clause. So, having that in mind, the only dependent clause among these examples is 'when you return from California'. Therefore, the correct answer is B.
