Question

buoyancy is an upward force experienced by an object that is less dense than the fluid it is in. buoyancy and gravity work in opposite directions. gravity pulls an object down and buoyancy pushes an object up. objects that are less dense than water float and objects that are more dense than water sink.

why do scuba divers need to wear weights to stay underwater?
the weights help them overcome their natural buoyancy.
people are not buoyant.
the weights increase their buoyancy.

Explanation:

Buoyancy is an upward force on less dense objects. Divers need weights to counteract their natural buoyancy (since their body density is close to water, plus gear may add buoyancy), allowing them to stay underwater. The first option correctly states this; the other options are incorrect (people are buoyant, weights do not increase buoyancy).

Answer:

A. The weights help them overcome their natural buoyancy.