A cab company charges $12 per mile for a lift to the airport.

What change would the company make to their charges to make this a non proportional situation?
(1 point)

O Charge $4 per mile instead of $12
O Charge $15 per mile instead of $12
O No changes are needed
Charge a flat rate of $20 and then $12 per mile

Charge a flat rate of $20 and then $12 per mile.