Since it is 0.5 per serving between 0 and 8 ounces the graph would intersect at (1, 0.5) and it does for B. And then it says $4 for any serving 8 oz and 12 oz. B shows that the line changes to 4 dollars when it reaches 8 oz. Sorry for the terrible explanation.
The answer is (B), because the rate of the function is 0.50 from 0 to 8 ounces, thus the line should have a slope of 1/2. But afterward, it levels off horizontally as every ounce above 8 ounces to 12 ounces is $4.
