A shortstop catching a line drive describes an ___________ movement.

The correct answer focuses on the concept of automatic movement, which refers to actions that are performed without conscious thought or significant deliberation, often as a result of practice and muscle memory. In the case of a shortstop catching a line drive, the action is typically a reflexive response developed through repeated practice. This means that the shortstop does not think through each individual step while catching the ball; instead, their body instinctively knows how to react based on prior experiences and training.

This automaticity is crucial in sports, where split-second decisions are necessary. The movement becomes almost second nature due to the high level of skill and familiarity the player has developed. Thus, the correct answer highlights the natural and instinctive aspect of the movement that arises from extensive practice and familiarity with the task.