Petra is able to imagine what would happen if parents were held legally responsible for the crimes of their children. She is capable of making an argument for or against this, regardless of her opinion. Which stage in Piaget’s theory best describes this ability?

The answer is formal operational.

Explanation:

According to Piaget's structure of cognitive development, during this stage children have developed abstract and logical thought. This means they don't longer need concrete or physical reference in order to understand or manipulate ideas.

During the formal operational stage, people are able to imagine the outcome of hypothetical situations, do mathematical calculations in their heads and think scientifically.

a is the final ! : )