Answer:
A) Jennifer will experience negative externalities.
Step-by-step explanation:
Externalities are essentially just the consequences of activities on unrelated third parties. There can either be positive or negative.
Jennifer being a serious student gives her a private benefit, but it also has a positive consequence for society as a whole (educational benefits). That would be considered a positive externality.
But with the question of the living situation - it would lead to a negative externality for Jennifer as the noise and distractions would negatively impact her studying.