Linda Darling-Hammond, Stanford Professor, Found Certain Teacher Factors That Were

Linda Darling-Hammond, Stanford professor, found certain teacher factors that were more important in predicting student success than student poverty, minority status, and language background.  Which one of the following is not one of those factors?

A) Teachers who had an undergraduate GPAs of greater than 3.8
B) Teachers who had a major in the subject they were teaching and were fully certified
C) Teachers who had a high-quality teacher education program
D) None are correct