Final answer:
The unit that can be used to figure out the relationship between the height of 1 can and the height of 2 cans is Ratio.
Step-by-step explanation:
The unit that can be used to figure out the relationship between the height of 1 can and the height of 2 cans is Ratio. A ratio is a comparison of two quantities and can be used to represent the relationship between two sets of numbers.
For example, if one can is 5 inches tall, and two cans stacked on top of each other are 10 inches tall, then the ratio of the height of 1 can to the height of 2 cans is 1:2. This ratio shows that the height of one can is half the height of two cans.
Therefore, the correct answer is C. Ratio.