Answer:
The correct answer is letter "C": risk-free rate.
Step-by-step explanation:
The United States government issues a variety of debt obligations to finance its operations. Those with the shortest maturity are called Treasury Bills or T-Bills. One of the unique features of T-Bills is that the government does not make regular interest payments to the holder. Instead, the securities are sold at a price below its face value resulting in a profit at the maturity date.
T-Bills are seen as low-risk investments compared to other securities being the closest to risk-free return in the market.