How should a middle school teacher respond to the errors made by the students during the process of learning?

The errors that children make during the learning process can be:

Students' errors are important because they - A. are an important tool in classifying students into groups of 'passed' and 'failed'. B. provide a way for teachers to diagnose learning difficulties. C. provide an insight into the child's thinking and help to identify solutions. D. provide space for removing some children from the class.