Two blocks of equal volume are held fully submerged in water, one made of aluminium and one of lead. How do the buoyant forces on them compare?

1. The buoyant force equals the weight of the fluid displaced, so it depends on the displaced fluid and not on what the object is made of. 2. Both blocks are fully submerged and have equal volumes, so each displaces the same volume of water. 3. Equal volumes of the same water weigh the same, so the two buoyant forces are exactly equal. 4. The denser lead block still sinks faster, but that is because its own weight is larger, not because buoyancy has changed. 5. Buoyancy never vanishes for a submerged object, so the last option contradicts the principle outright. _Source: OpenStax College Physics (CC BY 4.0), Ch 11 "Fluid Statics", section 11.7 Archimedes' Principle_