A common test for liver function involves sprinkling sulfur powder onto a sample of urine (mostly water with dissolved bodily waste). Sulfur powder sprinkled on a sample from an Individual with impaired liver function will sink because the urine contains a high level of bile salts, while the sulfur powder sprinkled on normal urine samples will float. Which of the following best explains why bile salts cause the sulfur powder to sink?

A. Bile salts decrease the surface tension of the urine sample.

B. Bile salts increase the water potential of the urine.

С. Bile salts increase the density of the urine sample.

D. Bile salts decrease the strength of the covalent bonds within a water molecule.