When making simple syrup, the traditional and most common ratio of sugar to water is one part sugar to one part water. This allows the sugar to dissolve easily in the water, creating a balanced syrup that can be used in various recipes and beverages. This specific ratio helps to ensure that the syrup is neither too thick nor too thin, making it ideal for mixing in cocktails, sauces, and other applications.
Thus, the correct answer is:
O A. one part sugar to one part water.
