Answer:
The answer to the question: This is problematic, because? In regards to the case of Katie, an underage teenager who goes to a college party for the first time and faces the issue of whether accepting the rules that she cannot drink because she is too young, or do so because others like her are doing it, is, that peer pressure, and the constant desire to fit in and not stand out among her peers, will probably push Katie to erase the limits and step out of the limitations, probably leading her to drink.
This is a big issue not so much because of the rules that Katie would be breaking, but rather, because Katie is relinquishing her boundaries and her priniples in order to adapt to her new environment, and in her desire to fit in with her peers, she will believe that her actions will be justified because everyone else is also doing it. Katie will drink because the others are doing so and there will be no reason for her to hold back.