Star corporation has issued bonds 2 years ago with a 9% coupon rate. Their bonds are currently trading at $928 in the market. Which of the following

Star corporation has issued bonds 2 years ago with a 9% coupon rate. Their bonds are currently trading at $928 in the market. Which of the following has most likely occurred since issue?a. interest rates decreasedb. inflation increasedc. risk decreasedd. real rates of return increased