Which Is the CORRECT Approach for Managing a Large Improvement

Which is the CORRECT approach for managing a large improvement initiative as smaller iterations?

A) Each iteration should be designed before starting the initiative and implemented without feedback
B) Feedback should only be taken into account when one iteration fails to meet its objective
C) Feedback should be reduced for large improvements as it is unlikely that circumstances will change
D) Each iteration should be continually re-evaluated based on feedback