Answer:
c. interest rates on bonds of different maturities move together over time.
Explanation:
"When riding the yield curve, an investor will purchase bonds with maturities longer than the investment horizon and sell them at the end of the investment horizon. This strategy is used in order to profit from the normal upward slope in the yield curve caused by liquidity preferences and from the greater price fluctuations that occur at longer maturities."
Reference: Chen, James. “Riding the Yield Curve.” Investopedia, Investopedia, 25 July 2019