Which Statement Correctly Explains How to Maximize the Effectiveness of a Direct

Which statement correctly explains how to maximize the effectiveness of a direct claim and complaint message?

A) Make the company ask for any copies of your relevant receipts or guarantees.
B) If you have a complaint, you'll get the best results if you vent your complaint online using social media such as Facebook and Twitter.
C) Write a letter because letters are taken more seriously and establish a record of the complaint.
D) If you make your complaint on social media, a company will find it by using Google Alerts