The correct answer is B. because over time, water is stronger than rock.
In Daoism, one of the key teachings is the principle of "wu wei," which means "effortless action" or "non-action." This principle emphasizes adaptability, softness, and yielding, much like the nature of water, which can flow around obstacles and gradually shape the hardest of substances, like rock, over time. Water's ability to overcome challenges through persistence aligns well with Daoist philosophies.
While D, "because water is a basis for human life," is true in a broader context about the importance of water, it does not capture the specific Daoist teaching of adapting and being resilient like water in the face of challenges.