Final answer:
Buoyancy is the upward force exerted by a fluid that opposes the weight of an immersed object, and it is described by Archimedes' principle.
Step-by-step explanation:
The term that describes the upward force that acts on an object submerged in a fluid is buoyancy. This is choice C. Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. According to Archimedes' principle, buoyant force is the net upward force on any object in any fluid. When the buoyant force is greater than the object's weight, the object will float to the surface. If the buoyant force is equal to the object's weight, the object will remain suspended at the current depth. However, if the buoyant force is less than the object's weight, the object will sink.