Answer:
C) Vendor bulletin board
Step-by-step explanation:
-Customer service refers to the assistance that helps users with questions or problems that they may have.
-User manual refers to a guide that products have that shows how to use them.
-Vendor bulletin board is a web forum created by the vendor in which users can post information, questions and opinions.
-Video tutorial is a video that teaches how to do something.
According to this, the web resource that would be most helpful for Maria to read comments and suggestions before she begins baking is the vendor bulletin board.