Final answer:
To find the amount of soda for each cup when poured evenly, divide the total amount of soda by the number of cups, represented by the formula C/S.
Step-by-step explanation:
The question is asking how to determine the equal amount of soda that would be in each cup if it were poured evenly. The correct formula to use in this scenario is A) C/S, where C represents the total amount of soda in all cups combined, and S is the number of cups available. This ratio will give you the amount of soda that should be in each cup for an even distribution.