Soru

Passage

In 1965, chemist Stephanie Kwolek was analyzing synthetic fiber chains at DuPont in search of a lightweight material to reinforce car tires. During her experiments, she generated a strange, cloudy solution that looked unlike the thick, clear polymers she typically worked with. Rather than discarding the unusual mixture, Kwolek convinced a colleague to run it through a spinneret, a machine used to draw liquid polymers into fibers. The resulting fiber was astonishingly strong—five times stronger than steel on a pound-for-pound basis—and resistant to both heat and corrosion. [1]

DuPont quickly recognized the commercial potential of this new material, trademarking it as Kevlar. In the decades following Kwolek's discovery, Kevlar found applications in racing sails, bicycle tires, and optical fiber cables. Most notably, its high tensile strength and lightweight nature revolutionized personal armor, saving the lives of countless military personnel and law enforcement officers.

Question

The writer wants to add a sentence at the end of the first paragraph (at point [1]) to conclude the discussion of Kwolek’s laboratory discovery and transition to the next paragraph's focus on Kevlar's commercial applications. Which of the following sentences best accomplishes this goal?