Final answer:
The correct feature of the methodology used for creating factor portfolios like those in the Fama-French three-factor model is that it assumes a linear relationship between factor characteristics and future returns. The correct answer is option C.
Step-by-step explanation:
The correct statement that describes the feature of the methodology used to create factor portfolios, like the size and value-growth factors in the Fama-French three-factor model, is c. the factor assumes a linear relationship between factor characteristics and future return.
This premise is that certain characteristics of stocks (like size or book-to-market value) systematically influence their expected returns. In a hedged portfolio, these characteristics are isolated, allowing for a purer assessment and potential profit from these factor premiums.
This means that while a factor portfolio may maintain exposure to broader market risk, it specifically taps into and leverages these factor characteristics for its investment strategy. The correct answer is option C.