Answer:
c. Accounts payable.
Explanation:
The capital structure is a mix of debt and the equity
And, the formula to compute the weighted average cost of capital is shown below:
= Weightage of debt × cost of debt × ( 1- tax rate) + (Weightage of preferred stock) × (cost of preferred stock) + (Weightage of common stock) × (cost of common stock)
Since the account payable is the current liabilities and therefore it is not use for computing the WACC.