Credible writing is based on research material.Your research sources should come from:

The correct answer is A. authoritative.

Explanation: Credible writing relies on authoritative sources, as they provide reliable and well-researched information. Authoritative sources are typically recognized experts or institutions in a specific field, ensuring the accuracy and trustworthiness of the information. While well-known and popular sources can provide valuable insights, they may not always be reliable or thoroughly vetted. Therefore, focusing on authoritative sources is essential for credible writing.