Answer: the value of a stock index.

## Explanation **Residual Income Model Applications:** - **Option B: If a company is creating value** - This is a primary use of residual income models. Residual income measures whether a company is earning returns above its cost of capital, which indicates value creation. - **Option C: The opportunity cost of a company's equity capital** - Residual income models explicitly incorporate the cost of equity capital as the required return, making this a fundamental component of the model. - **Option A: The value of a stock index** - This is the least likely use because residual income models are typically applied to individual companies, not broad market indices. Stock indices represent diversified portfolios where residual income analysis would be impractical and less meaningful. Residual income models are most effective for valuing individual companies and assessing their value creation capabilities, not for valuing diversified market indices.

Author: LeetQuiz Editorial Team