The correct option is (c) idiosyncratic risk.
Idiosyncratic risk is a sort of investing risk that is inherent to a single asset (such as a specific company's stock), a collection of assets (such as a certain sector), or even a highly unique asset class (like collateralized mortgage obligations). A particular risk or unsystematic risk is another name for idiosyncratic risk.
Thus, systematic risk, which is the general risk that impacts all assets, such as changes in the stock market, interest rates, or the whole financial system, is the opposite of idiosyncratic risk.
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