Answer:
The correct answer is letter "A": open facts are preferred to closed facts.
Explanation:
While planning a project, open facts are those that have not happened yet in contrast to closed facts that are those that already occurred. Managers prefer to start from the bottom while planning since it is better to explore the new path with a "clean sheet" than being subject to events that already took place and condition the course of a project.
Open facts, then, are more preferred than closed facts.