Which of the following illustrates the effects of PTSD on daily functioning?

The choice highlighting "difficulty concentrating and completing tasks" accurately depicts a common effect of Post-Traumatic Stress Disorder (PTSD) on daily functioning. Individuals with PTSD frequently experience cognitive disturbances, which can manifest as challenges in attention, memory, and decision-making. This impairment can lead to significant difficulties in both work and personal settings, hindering their ability to perform daily tasks effectively.

In contrast, the other options do not align with the typical consequences of PTSD. Improved relationships with peers might indicate personal growth or healing, which is generally not a direct effect experienced during active symptoms of PTSD. Increased levels of motivation are often absent in individuals struggling with PTSD, as symptoms such as avoidance and anhedonia can impede the drive to engage in activities. A keen sense of introspection might suggest self-awareness but does not encapsulate the negative impact PTSD has on daily life. Thus, the difficulty in concentration is the most representative of the struggles faced by individuals with PTSD, illustrating the disorder's tangible effects on their daily functioning.