Any increase in a firm's cost of debt will will result in an increase in the firm's cost of capital.
This refers to an effective rate that a company pays on its debt such as a bond or loans to its creditors, debtholders etc.
As the cost of capital means the returns that are demanded by investors who are part of the ownership structure, then, any increase in the cost of debt will increase the investor's return.
Therefore, the Option E is correct.
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