Rate of interest which is usually discussed by investors whenever rate of return is discussed is classified as

yield to maturity
yield to return
yield to earning
yield to investors

The correct answer is: A. yield to maturity.

Yield to maturity (YTM) is the rate of return an investor expects to earn on a bond if they hold it until it matures. It is calculated by taking the present value of all future cash flows from the bond and dividing it by the purchase price of the bond.

YTM is a useful tool for investors because it allows them to compare the returns of different bonds. It is also used to calculate the fair value of a bond.

The other options are incorrect because they do not accurately describe the rate of interest that is usually discussed by investors whenever rate of return is discussed.

B. Yield to return is a general term that can refer to any rate of return, including YTM.

C. Yield to earning is the rate of return an investor expects to earn on a stock based on the company’s earnings.

D. Yield to investors is a general term that can refer to any rate of return that an investor receives.