Final answer:
The correct answer is D) Depth control, as buoyancy control involves pitch, yaw, and roll, not depth.
Buoyancy is the upward force exerted by a fluid that allows objects to float, sink, or remain at a constant depth.
Step-by-step explanation:
The three axes of buoyancy control include pitch control, yaw control, and roll control. The correct answer to the question is D) Depth control.
Buoyancy control is focused on how an object is oriented and stabilized in the water. Pitch control refers to the tilting up or down around a horizontal axis, Yaw control is the turning left or right around a vertical axis, and Roll control is the tilting side to side around a longitudinal axis.
Buoyancy itself is defined in answer D as an upward force exerted by a fluid that opposes the weight of an immersed object.
As illustrated by examples in figures, even sinking objects like anchors are partly supported by water, submarines use ballast tanks to adjust their buoyancy, and helium balloons demonstrate the buoyant force in the air.
The buoyant force allows objects to float, sink, or remain suspended depending on whether it is greater than, less than, or equal to the object's weight.