What should be added to sugar to make the sugar water recipe?

The correct answer is to thoroughly dissolve sugar into warm water because using warm water allows the sugar to dissolve more effectively and quickly compared to cold or cool water. When sugar is added to warm water, the heat reduces the viscosity of the water, enabling the sugar crystals to break apart and disperse evenly throughout the solution, ensuring a well-mixed and homogeneous sugar water.

Other choices would not achieve the same result. For example, unsweetened tea is a different beverage with its own flavor, and using cool or ice water may slow down the dissolving process, leading to undissolved sugar settling at the bottom, resulting in an uneven mixture. Warm water facilitates a smoother and more efficient recipe-making process for sugar water.