Final answer:
Hitting a baseball off a tee is a closed skill, while the other options are open skills.
Step-by-step explanation:
A closed skill is a skill that is performed in a predictable and stable environment, where the performer has little to no interaction with the external environment. In this case, hitting a baseball off a tee would be considered a closed skill. The player has complete control over the timing and execution of the skill, without any external factors affecting their performance.
Dancing with a partner, shooting a three-pointer during a game, and playing defense in hockey all involve unpredictable and constantly changing environments with interactions from other players or factors. These skills require the performer to adapt and respond to the changing conditions, making them open skills.
Learn more about Types of skills in sports