Answer:
C. Your friend is demonstrating trial-and-error, and you're demonstrating insight.
Step-by-step explanation:
Insight means that you have an understanding and knowledge about the subject in a inner way, that you know more deeply the matter, and in this case as you have previous knowledge from when you tried to move the chair in the past, and now you know how to do it, while your friend is trying a new way to do it based on a trial and error, since the first way didnĀ“t work, now he wants to rotate it since he thinks that is the next logical step.