Answer :

To determine the appropriate unit for measuring the height of a cake, let's review the given options one by one and see which would be suitable:

- OA) tons: This unit is generally used to measure very heavy objects, typically in large-scale contexts such as industry or cargo. It is not appropriate for measuring the height of something like a cake.

- OB) milliliters: This unit measures volume, specifically for liquids. While cakes might be related to measurements involving volume when considering ingredients, milliliters are not suitable for measuring height.

- OC) kilograms: This unit measures weight or mass. Although it might be used to quantify the weight of a cake, it is not appropriate for measuring its height.

Taking these points into consideration, none of the provided options (tons, milliliters, or kilograms) are suitable for measuring the height of a cake. The appropriate units for measuring the height of a cake would be length units such as centimeters or inches. Therefore, none of the provided options are correct for this question.