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After studying the disease for years, scientists have identified the agents that cause it, but they haven't found a cure for it. Which of the following options punctuates this sentence correctly?

A.After studying the disease for years; scientists have identified the agents that caused it, but they haven't found a cure for it.B.After studying the disease for years scientists have identified the agents that caused it, but they haven't found a cure for it.C.After studying the disease for years, scientists have identified the agents that cause it, but they haven't found a cure for it.D.After, studying the disease for years, scientists have identified the agents, that cause it, but they haven't found a cure for it.

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After studying the disease for years, scientists have identified the agents that cause it, but they haven't found a cure for it. Which of the following options punctuates this sentence correctly?

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