Final answer:
Practice is the key to improving learning and performance when trying to learn a complex skill.
Step-by-step explanation:
The correct answer to the question is c) practice.
Whenever you are trying to learn a complex skill, practice will improve learning and performance. Practice allows you to repeat the desired behavior, which strengthens the neural connections related to that skill. Through practice, you can refine your technique and become more proficient in the skill you are learning.