Answer:
So far, she hadn't found a way to broach the subject with Brandon. She was reluctant to broach the subject. Finally she dragged up the courage to broach the subject.
Explanation:
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Among the given choices, only the fourth choice has a noun that refers to the specific car. The noun, which is proper, is the Jetsetter Series 4. All the other choices for this item only has common names or nouns that are cars.