A ten$-$year annuity pays $$2,500.$ Based on the discount rates applied by investors today, the market price is $$22,000.$ If the price increases to $$22,500$ tomorrow, that means:

a$)$ the discount rate is higher

b$)$ the discount rate is lower

c$)$ the discount rate is unchanged

d$)$ question cannot be answered without knowledge of today$$s discount rate