When Working with Co-Workers and Supervisors, Which of the Following

Multiple Choice

 When working with co-workers and supervisors, which of the following is a good practice?

A) if you have a problem with a co-worker, first discuss it with other co-workers
B) if you need to give bad news or criticism, use email to lessen the blow
C) be professional by putting business matters over personal matters
D) never tell your boss you can't take on a new project, even if it's beyond your skills