Final answer:
Without sufficient information such as the risk-free rate and the market rate of return, the expected rate of return on a security with a beta of 2.1 cannot be determined; therefore, the correct choice is 4) Not enough information provided.
Step-by-step explanation:
The question of determining the expected rate of return for a security with a given beta cannot be answered with the information provided. The expected rate of return on a security in the market is typically estimated using the Capital Asset Pricing Model (CAPM), which takes into account the risk-free rate, the market rate of return, and the security's beta. The formula is:
Expected return = Risk-free rate + Beta x (Market return - Risk-free rate)
Without the risk-free rate and market rate of return, we cannot calculate the expected return, so the correct answer is 4) Not enough information provided.