The correct answer is B. Behavioral finance.
Behavioral finance is a field of study that combines psychology and finance to understand how human behavior affects financial decisions. It is based on the idea that investors and managers are not always rational, and that their decisions can be influenced by cognitive biases, emotions, and social pressures.
Risky finance is a field of study that deals with the measurement and management of risk. It is concerned with the identification, quantification, and control of risks that can affect financial assets and liabilities.
Premium finance is a field of study that deals with the pricing of financial assets and liabilities. It is concerned with the determination of the fair value of financial instruments, taking into account the risk and return characteristics of the assets and liabilities.
Buying finance is a field of study that deals with the acquisition of financial assets. It is concerned with the identification, evaluation, and acquisition of financial assets that meet the investment objectives of the investor.
In conclusion, the correct answer is B. Behavioral finance.