The correct answers are B. Billing Account Manager and E. Billing Account Billing administrator. These roles possess the requisite permissions to alter the billing account for projects. Here's why the other options are incorrect:

• A. Project Editor: This role has limited permissions and lacks the authority to change the billing account.
• C. Project Billing manager: Although this role has some billing-related permissions, it may not suffice for changing the billing account.
• D. Project Owner: While Project Owners can manage project settings, they might not have the permissions to change the billing account.

Thus, the Billing Account Manager and Billing Account Billing administrator are the essential roles for this task.