Final answer:
An investor's holding period return on a bond would be less than the bond's yield to maturity if coupons were reinvested at a rate lower than the original yield to maturity. This accounts for the reduction in total return over the bond's holding period, deviating from the reinvestment assumption used in yield to maturity calculations.
Step-by-step explanation:
An investor's holding period return would be less than the bond's yield to maturity if the coupons were reinvested at a rate below the yield to maturity. This scenario is illustrated by choice B) the coupons were reinvested at a rate below the yield to maturity. The holding period return includes both income from coupon payments and capital appreciation or depreciation of the bond's price. When coupons are reinvested at a lower rate than the original yield to maturity, the total return over the holding period will decrease compared to the yield to maturity expected at the time of purchase.
The concept of yield to maturity is essential in understanding the total expected return of a bond over its entire lifecycle. It is based on the assumption that all coupon payments are reinvested at the bond's yield to maturity. Therefore, any deviation from this reinvestment assumption, such as reinvesting at lower rates, impacts the investor’s actual returns. Conversely, as described in option D), if the bond was redeemed at a premium, it would increase the holding period return compared to the yield to maturity, not decrease it. Options A) and C) are not directly related to the relationship between holding period return and yield to maturity.