Answer: 3. I might not be assigned to the college dormitory of my choice.
Step-by-step explanation:
A senior slum refers to a condition that some high school seniors experience where they lose academic focus and begin to perform worse in academics.
A senior slump by definition, affects high school seniors which means that not being assigned to a college dormitory cannot be a consequence of it because that would require being a college student in the first place.
As the people affected are still in high school, a serious consequence would be one that affects their high school results such that they don't get into college in the first place after which they can then begin to worry about dormitories.