Which of the following represents a proportional relationship?

To determine whether a relationship is proportional, you typically look for a constant ratio between two quantities. In a proportional relationship, if one quantity doubles, the other quantity also doubles. This can be represented with the equation \(y = kx\), where \(k\) is a constant (the constant of proportionality).

Please provide the specific options or relationships you would like to evaluate, and I can help determine which, if any, represent a proportional relationship.