Which of the following represents a proportional function?
A.the amount of money on a gift card, if the original amount is $200 and $50 is spent once a week for 4 weeks
B.the savings in a bank account, if $100 is initially deposited and $25 is deposited each week afterwards
C. the amount of money charged for a hotel room, if the cost is $86 per day
D. the amount of money that is charged for a cleaning service, if the cost is $25 per visit, plus $15 for each hour of work
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