Which of the following scenario's is most likely to result in a bond being called?

20-year bond with 2 remaining 8% coupon payments in a 7% interest rate environment

10-year bond with 18 remaining 8% coupon payments in a 8% interest rate environment

10-year bond with 18 remaining 8% coupon payments in a 10% interest rate environment

10-year bond with 18 remaining 8% coupon payments in a 6% interest rate environment

20-year bond with 2 remaining 8% coupon payments in a 9% interest rate environment