The correct answer is: B. one glass of orange juice with two slices of bread.
Based on the given information, the food item that consumes the highest amount of water is "one glass of orange juice with two slices of bread."
According to the provided data, the water footprint of orange juice is 170 liters, and the water footprint of one slice of bread is 40 liters, totaling 210 liters for this combination.
Therefore, the correct answer is: B. one glass of orange juice with two slices of bread.