Final answer:
The best representation of the cognitive behavioral approach to treating PTSD among the given options is 'Modifying dysfunctional thinking', which aligns with CBT's focus on altering negative thought patterns and behaviors.
Step-by-step explanation:
The phrase that BEST represents the cognitive behavioral approach to treating PTSD is b. Modifying dysfunctional thinking. Cognitive Behavioral Therapy (CBT) is centered on the premise that psychological problems are partly due to faulty or dysfunctional ways of thinking and learned patterns of unhelpful behavior. CBT aims to modify the dysfunctional thinking patterns associated with PTSD, alongside behavioral strategies to better manage distress and improve emotional regulation. Techniques may include exposure therapy, where individuals confront their traumas in a safe and controlled environment to reduce fear and avoidance behaviors, and cognitive restructuring, which helps to modify negative thought patterns related to the traumatic event.