During classroom discussions, juan never names a student before asking a question. he always asks a question first and then names the student whom he wants to answer the question. according to kounin, this is an example of:

The answer is: Group altering
According to kounin, group altering refers to a type of classroom management where the interaction within the class tend to be unpredictable between one student to another. (when he asked the question first, it would most likely make all the students become more  focus in anticipation of being suddenly pointed and asked)