This image depicts key components involved in regulating your internal biological clock. Which letter indicates the suprachiasmatic nucleus? 
Definitions:
Goal Acceptance
The degree to which individuals and groups agree with and commit to achieving specific goals.
Specific Goals
Well-defined, unambiguous, and measurable objectives that are to be achieved within a set timeframe.
Difficult Goals
Targets that are challenging and hard to achieve, often requiring extra effort and determination.
Feedback
Information provided by an observer (such as a supervisor, peer, or system) regarding aspects of one's performance or behaviour.
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Q431: The suprachiasmatic nucleus is a cluster of