Final answer:
The unit rate of lemonade to cranberry juice in the given recipe is 1:2, which is the ratio of 1 liter of lemonade for every 2 liters of cranberry juice.
Step-by-step explanation:
The question asks us to calculate the unit rate of lemonade to cranberry juice in a recipe. The recipe calls for 1 liter of lemonade and 2 liters of cranberry juice. To find the unit rate, we compare the amounts with reference to one unit of the first item which is lemonade in this case. Since the recipe uses 1 liter of lemonade and 2 liters of cranberry juice, the unit rate of lemonade to cranberry juice is 1:2, not any of the other options provided.
To clarify further, a unit rate is found by dividing the quantities to get how much of one item is there per unit of another. In this case, we have 1 liter of lemonade for every 2 liters of cranberry juice, hence the unit rate is expressed as 1:2.