Discussion

Explanation:

Statement (a) (Third Paragraph): “We wouldn't make it far in life without motor: proteins. Our muscles wouldn’t contract. We couldn't grow, because the growth process requires cells to duplicate their machinery and pull the copies apart.” Therefore, (a) is valid from the passage.
Statement (b) (Second Paragraph): “Because these molecules are essential for cell division, scientists hope to shut down the rampant growth of cancer cells by deactivating certain motors.” Tuberculosis is not mentioned and therefore statement (b) is not representative. We can eliminate option 1.
Statement (c) (Last Paragraph): “Ultimately, Mahadevan and Matsudaira hope to better understand just how these particles create an effect that seems to be so much more than the sum of its parts.” The meaning is implied.
Statement (d) (Fifth Paragraph): “For example, one such engine is a spring-like stalk connecting a single-celled organism called a vorticellid to the leaf fragment it calls home. When exposed to calcium, the spring contracts, yanking the vorticellid down at speeds approaching to 3 inches (8 centimeters) per second.” Statement (d) has not been given explicitly. Since d is not true, we can eliminate options 3 and 4 (which state that (d) is true).
That leaves us with option 2.
Hence, the correct answer is option 2.

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