Which situation does NOT constitute a dangerous background while shooting?

Open terrain does not constitute a dangerous background while shooting because it generally allows for a clear line of sight and minimizes the risk of inadvertently hitting someone or something that could lead to harm. When shooting in open terrain, there are fewer obstacles that could potentially create ricochet hazards or concealment for bystanders. This environment typically offers a safer backdrop, as there is less chance of projectiles deflecting into unintended areas.

In contrast, situations involving people nearby, buildings, and rock cliffs pose greater risks. People can be unpredictable and may unknowingly enter the line of fire. Buildings can create hazards with stray bullets potentially ricocheting off surfaces, and rock cliffs can lead to a situation where a bullet could bounce back towards the shooter or others, posing significant safety concerns. Therefore, open terrain is the safest choice among the options presented.