Answer: C. respect the customer’s privacy and not ask any further questions.
Step-by-step explanation:
Since the customer is not willing to share details related to his experience with competitor products, the best thing to do in this case is to respect the customer’s privacy and not ask any further questions.
It's good to respect the privacy of people if they are not willing and ready to give out certain information. In this case, it should be noted that forcibly trying to get the details out of the customer isn't ideal.
Likewise, referring the customer to someone more experienced isn't necessary in thus regard since the customer isn't willing to share any information.
Therefore, the correct option is C.