A 32-year-old woman presents to her primary care physician complaining of overwhelming fear and anxiety. Patient states that she has been having difficulty concentrating and sleeping because she “can’t seem to keep her mind off of everyday issues in life”. Patient also states that for the past 8 months she has been feeling anxious and worried about many things and often feels tense and restless. She denies any past history of substance abuse. Which of the following drugs would be considered first-line treatment for her illness?