Final answer:
In a weightlifting competition, athletes predominantly demonstrate the skill-related component of power, which is a blend of strength and speed crucial for lifting heavy weights efficiently.
Step-by-step explanation:
The skill-related component that athletes demonstrate in a weightlifting competition is c) Power. Power in a physical and sports context is the ability to exert a maximal force in as short a time as possible, as in accelerating, jumping and, in this case, lifting weights. It is a combination of both strength and speed, which are crucial for athletes lifting heavy weights during a competition.
While agility and balance may play a role in the overall performance of a weightlifter, they are not the primary components showcased. Agility refers to the ability to change direction rapidly without losing balance, speed, or strength, and balance is the ability to maintain the body's center of mass over its base of support. However, the most critical component for a weightlifter is power, as they must be able to lift as much weight as possible in a single explosive movement.