Procedures used to reduce risk to auditors

What would you suggest? Why are there 3, not 2, 4 or more? Sounds like a question you've been asked to answer.

I would suggest the 3 are: Self interest threat Firms competence to perform potential work Ethical threats Familiarity threat Advocacy threat But Im not really sure what the 3 key threats are

You were asked for procedures not threats. I do not like the way the question suggests that there are precisely three procedures (the use of the word 'the' in 'the 3 procedures'). There are many procedures that can be followed to reduce risk: Write to outgoing auditors. Ensure it is legal and ethical to act Investigate the client and directors Gain an understanding of the client Plan carefully Consider the composition of the audit team etc