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which situation represents a proportional relationship?

a: the cost of purchasing a basket of apples for $1.25 per pound plus $5.00 for the
basket
b: the cost of purchasing bananas for $5.00 per box of bananas with the delivery
charge of $3.00
c: the cost of purchasing limes for $ 0.65 per pound with a coupon for $1.00 off
the total cost
d: the cost of purchasing avocados for $1.75 per pound plus a shipping fee of
$0.16 per pound.