Clustering is a type of prewriting that allows you to explore many ideas as soon as they occur to you. Like brainstorming or free associating, clustering allows you to begin without clear ideas.
Sorry, but it's impossible to answer all your question because of character limit. But I suggest you to search via Internet sites that are specialized on story summaries. You can find what you need on such sources.
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the answer is B. the first road user at an intersection must leave as quickly as possible
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