In a proportional relationship, the ratio between the two variables are equaivalent.
We can also say that one variable is a constant times the second variable in a proportional relationship.
Therefore, the situation that does not represent a proportional relationship from the given choices is:
C. The weight in x weeks of a puppy that gains 2 pounds per week it is starting weight is 5 pounds.
This is because there is an initial value of 5 pounds here