Not sure how to get this one.

The following bonds are available for purchase right now: Name Maturity Coupon Betty Bob Bonnie Billy 10 years 10 years 5 years 5 years 6% 10% 6% 10% 7. Which bond has the HIGEST interest rate risks? 8. Assume that by miracle, all of the above bonds have YTM of 7%. Which bond would you expect to be priced at a highest discount from par value today? 9. Your investment horizon is 10-years. Which of these Bonds have the LOWEST reinvestment risk