Steph wants to buy s tomato plants, and Diego wants to buy d tomato plants. Each plant costs $7. Steph will use a coupon that will give them $25 off the total cost of all their plants. Which expression represents the total cost of all the plants with the discount?

A. 7(s + d) - 7(s + d)(0.25)

B. 0.75(7s) + 7d

C. 7(s + d) - 25

D. 25(s + d) - 7