A family wants to make an addition to a deck that extends off the back of their home. The current deck is 400 ft2. The addition will be 18.75 ft in length and 15 ft wide. What will be the total area of the deck once the addition is complete?
A: 681.25 ft2
B: 433.75 ft2
C: 281.25 ft2
D: 118.75 ft2