Patty needs assessment for potential methamphetamine use due to impulsive hook-ups, as her recent behavior raises substance use concerns. So, the correct choice is option C.
Patty's situation raises concerns about her recent behavior, and the most relevant assessment would likely be related to her mental health and potential substance use. Given the context, the most fitting option is methamphetamine use. Therefore, option C is the suitable choice.
Patty's engagement in a significant number of hook-ups through a phone app over a short period may be indicative of impulsive and risky behavior associated with substance use, such as methamphetamine. Substance use assessments would explore patterns of use, potential consequences, and their impact on mental health and relationships. While options like personality disorders, bipolar disorder, or bulimia nervosa can't be ruled out entirely without more information, the immediate concern appears to be the potential involvement of substance use, particularly given the recent and drastic change in behavior.