Which of the following situations form a proportional relationship?
a. 5 DVDs for $9 and 15 DVDs for $27
b. 6 cups of coffee for $8 and 9 cups of coffee for $14
c. 3 purses for $60 and 5 purses for $90
d. 12 cans for $3 and 30 cans for $7.50
e. 2 ink cartridges for $25 and 4 ink cartridges for $75
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