Which of the following groups have NOT been specifically targeted by terrorists?

The choice indicating that none of the groups listed have been specifically targeted by terrorists is correct because all the mentioned categories have been historically impacted by terrorist activities. Government officials are frequently targeted because they represent authority and power, making them symbols of the governmental structure that terrorists may oppose. Transportation systems have also been a major focus, as they can cause widespread disruption and fear, impacting daily life and economic stability. Civilians in public spaces are often targeted to maximize casualties and media attention, as attacks in these areas can lead to significant psychological effects on the general population. This reflects the broader strategies and motives of terrorist organizations, which aim to instill fear, gain attention for their causes, and challenge the status quo. Thus, the correct choice underscores the notion that all these groups are at risk of being targeted by terrorist actions.