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Explanation:

In paragraph 2, the author discusses how the rampant growth of cancer cells can be checked by deactivating certain motors. He further says that improving motor-driven transport can help treat diseases such as Alzheimer's, Parkinson's or ALS, also known as Lou Gehrig's disease.
Options 1 and 2 can be ruled out in light of this information.
Option 3 only talks about arresting cancerous growth.
Option 4 covers diseases in general. Therefore it is a more complete answer.
Hence, the correct answer is option 4.

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