The figure below shows a diagram separating out the different eras of the universe based on the events that occurred during that era. Each era is labeled by a different letter. 
Which of the sections of the image represents the dark era?
Definitions:
Leadership and Management
Refers to the roles and functions in guiding and controlling groups, organizations, or institutions towards achieving set objectives.
Leader Effectiveness
The measure of a leader's ability to achieve desired results, influence followers, and meet organizational goals.
Group Theory
A mathematical framework for studying the algebraic structure of groups, which are sets equipped with an operation that combines any two of its elements to form a third element in a way that satisfies certain conditions.
Relationships
Connections or associations between individuals or entities based on social, emotional, or professional ties.
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