The correct answer to this open question is the following.
Although the question does not include options, we can say the following.
Mrs. Patterson was told by Chris's previous teacher that he cannot sit still and often disrupts class discussion. As a result, Mrs. Patterson assigned Chris a seat in the back of the room and does not call on him. He becomes disinterested and shouts out during discussions. The result is an example of prejudging and stereotyping students.
Mr. Patterson is not doing something good believing what the previous teacher told him. Why? Because he doesn't know Chris and the reasons why Chris behaves and reacts that way. He probably had some problems and differences with the teacher, and Chris reacted to that.
That doesn't mean that Chris was going to act the same with the new teacher. But by prejudging and stereotyping him, Mr. Patterson is doing no service to resolve the problem. He even is making it worse, ignoring Chris.