Concept:Anaerobic respiration of yeast releases carbon dioxide gas, which is detected by the lime water test.Explanation:In the yeast setup, sugar is fermented to produce ethanol and carbon dioxide (CO2).Carbon dioxide turns lime water milky because it forms insoluble calcium carbonate.Therefore, to confirm the gas, it should be bubbled through lime water.Other tests do not identify CO2 correctly.Answer:B. Pass the gas through lime water
