The author of your text states, “For many students, spending time thoroughly discussing a few ...

The author of your text states, “For many students, spending time thoroughly discussing a few higher-level questions may be instructionally more valuable than answering numerous quick and easy questions.” Which of these is not a reason why this is so?

This gives the teacher opportunity to model strategies.
 
The teacher can prompt the student to use strategies he or she is in the process of learning.
 
This provides an opportunity to prevent concept-driven processing.
 
This provides opportunity for the teacher to explore a student’s understandings and confusions about higher-level comprehension tasks—and to assist with unraveling the confusions.