Final answer:
Marge is making it easier to perform desirable behavior by meeting at a coffee shop to avoid drinking alcohol.
Step-by-step explanation:
Marge's decision to meet her friends at a coffee shop instead of a bar is an example of c) making it easier to perform desirable behavior. By choosing an environment where alcohol is not the focus, Marge is creating a setting that supports her goal of not drinking alcohol. This strategy allows her to still socialize with her friends without the temptation of alcohol being present, making it easier for her to engage in healthier behavior.