To determine how much water an aluminum test object displaces, you need to know the volume of the aluminum object. The amount of water displaced by an object is equal to the volume of the object submerged in the water.
If you have the dimensions or mass of the aluminum object, you can calculate its volume using the formula for volume based on its dimensions or using its density (approximately 2.7 g/cm³ for aluminum) if you know the mass.
Without specific information about the size or mass of the aluminum test object, I cannot provide you with a definitive answer. Please provide more details, or clarify the context of the question, and I would be happy to assist you further! If you need me to choose one of the given options without additional context, I cannot do so accurately.