Final answer:
The correct option is (b) A baseball swing is an example of a repetitive skill that requires consistent practice to perform effectively.
Step-by-step explanation:
An example of a repetitive skill in sports and physical activities is the baseball swing. This skill is learned through practice and repetition, as athletes strive to consistently hit the baseball effectively during a game.
Other examples of repetitive skills include dribbling a basketball, jumping rope, and playing a musical instrument, all of which require repeated practice to improve and maintain proficiency.