Answer:
The correct answer is C. Be responsive as well as polite.
Explanation:
The customer is angry and possibly with zero tolerance to wait or for not receiving an immediate solution, after the purchase he did a week ago. So, the only real option to solve the issue is that Alan, as a skillful, resourceful and proactive Customer Service Executive will listen to the customer politely and come up with a solution. It's clear the customer will get even more mad if:
1. He has to write a complaint and bring it later.
2. He's being completely ignored by Alan. That behavior would be unacceptable.
3. Keep the customer waiting endlessly. That attitude would be disrespectful and aggressive.