An elderly woman who lives in an assisted living home comes…

An elderly wоmаn whо lives in аn аssisted living hоme comes to the clinic with her caregiver, who has noticed that this patient has diarrhea that has lasted >3 weeks and is not improving. The NP asks if this patient has taken any antibiotics in the past. The caregiver notes that 2 months ago she had dental treatment and was given an antibiotic for treatment.   Of the below-listed antibiotics, which has the highest potential risk for C. diff?