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To find the price of 7 bottles of brand B oil, we can use the equation given for brand B: y = 16x
Plugging in x = 7, we get: y = 16 * 7 = 112
Therefore, the price of 7 bottles of brand B oil is $112.
To find the price of 7 bottles of brand A oil, we can look at the table for brand A. Since the prices increase by $13 for each additional bottle, the price for 7 bottles will be 65 + (6 * 13) = 65 + 78 = $143.
The difference in price between 7 bottles of brand B oil and 7 bottles of brand A oil is $143 - $112 = $31.
Therefore, the answer is not provided in the options.