The correct answer is D. relevant risk.
A relevant risk is a risk that has the potential to affect the value of a portfolio. It is classified as such based on its contribution to the overall risk of the portfolio.
A classified risk is a risk that has been identified and categorized. It is not necessarily a relevant risk.
A contributed risk is a risk that has contributed to the loss of a portfolio. It is not necessarily a relevant risk.
An irrelevant risk is a risk that does not have the potential to affect the value of a portfolio. It is not classified as a relevant risk.