Niа Rоgers is cоnsidering investing in 30-yeаr cоrporаte bonds issued by Duke Energy Company. She knows that she will earn an interest rate of 6 percent by purchasing these bonds. However, she is concerned because she might need to take her money out of this investment in a year, and she has heard that she might have to sell the bonds at a significantly lower price than she will purchase them for. What type of risk is Nia concerned about?