What does FMC primarily help users to analyze?

The correct answer reflects that the Financial Market Curves (FMC) primarily helps users analyze fair market sector curves. This tool enables users to observe and assess the current yield curves across different sectors in the market, which can provide insights into market expectations, interest rate trends, and investment strategies.

Analyzing fair market sector curves is essential for understanding the relative value of different sectors and making informed decisions regarding asset allocation and risk management. Sector curves allow investors to compare yields among various segments of the market, providing a clearer picture of where value may lie or where risks may arise.

The other options, such as fair market indices, historical interest rates, and muni yield curves, while important financial concepts, do not specifically pertain to the primary function of the FMC. Thus, the focus on sector curves in the context of evaluating fair market conditions is what makes the correct answer relevant and vital for effective market analysis.