The number of fans who buy Super Bowl souvenirs doubles every week leading up to the big game. This week, 1400 people bought souvenirs. The expression 1400 • 2^(5) models the number of people who will buy souvenirs w weeks after this week. How many more souvenirs will be purchased next week than last week?
A) 2800
B) 2100
C) 1400
D) 700