Fred and Barney go to a baseball game on Friday. They buy four hot dogs and
8 bronto burgers and spend no more than $40. On Saturday they return to the same
ballpark and purchase only 2 hot dogs and 5 bronto burgers and spend more than
$20. Which of the following cannot be a solution?

A: hot dogs cost $4 and burgers are $3

B: hot dogs cost more than bronto burgers

C: hot dogs cost $2 and bronto burgers are $5

D: hot dogs and bronto burgers are the same price