can anyone please explain why the answer is d?

13. Which of the following bonds should be most attractive to an investor? (a) a $10,000 face-value security with a 3 percent coupon selling for $10,000 (b) a $10,000 face-value security with a 2 percent coupon selling for $10,000 (c) a $10,000 face-value security with a 2 percent coupon selling for $9,000 (d) a $10,000 face-value security with a 3 percent coupon selling for $9,000