Rosa fills a graduated cylinder with 100 milliliters of Liquid X. She fills another graduated cylinder with 100 milliliters of Liquid Y. Then, at the same time and from the same height, she drops a marble into each liquid. The marble hits the bottom of the cylinder containing Liquid Y first.

Viscosity is a liquid’s resistance to flowing. The marble falls more slowly through the more viscous liquid, so the cylinder where it takes longer to reach the bottom contains the more viscous liquid. Since the marble reaches the bottom of Liquid Y first, Liquid X is more viscous than Liquid Y, matching choice A.

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