Final answer:
Considering the physical properties of the substances on the list, the bottle containing a liquid that is not metallic should be relabeled as bromine, which is the only element listed that is a liquid at room temperature.
Step-by-step explanation:
If the contents of the bottle you found are liquid and do not look metallic, the element cannot be lithium (Li) because lithium is a solid metal at room temperature. By process of elimination and by considering the physical state at room temperature, you would relabel the bottle as bromine (Br). Bromine is the only non-metallic element that is a liquid at room temperature from the given options. Chlorine (Cl) is a gas, arsenic (As) is a solid, and helium (He) is a gas. Therefore, the correct answer is b) Bromine.