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The option that is the best buy is option 3.
The best buy is the option that has the lowest average cost. Average cost is the total cost of the bottles divided by the number of bottles.
Average cost = total cost / number of bottles
Option 1: $8.75 / 5 = $1.75
Option 2: $5.97 / 3 = $1.99
Option 3: $6.36 / 4 = $1.59
Option 4: $12.60 / 7 = $1.80
To learn more about division, please check: https://brainly.com/question/194007