Which security should sell at a greater price?

a. A 10-year Treasury bond with a 4% coupon rate versus a 10-yer T-bond with a 5% coupon.

b. A 3-month expiration call option with an exercise pirce of $40 versus a 3-month call on the same stock with an exercise price if $35.

c. A put option on a stock selling at $50, or a put option on another stock selling at $60 (all other relevant futures of the stocks and options may be assumed to be identical).