The factor that is likely to raise Olivia's reservation wage is:
Olivia learns that the job is more challenging than she initially thought.
This is because a more challenging job typically requires higher skills or effort, which could lead Olivia to expect a higher wage as compensation for the increased demands of the job. In contrast, the other factors mentioned (bonuses, struggling to pay rent, and taking on more debt) may not necessarily increase her minimum acceptable wage but could lead her to accept a lower wage than her initial reservation wage if her urgency to find a job increases.