Which of the following is the repeat unit for the polymer produced in the following reaction? 
Definitions:
Constellations
Groups of stars forming recognizable patterns in the night sky, traditionally named after mythological characters, animals, or objects, and used for navigation and astronomical purposes.
Self-Concept
Self-concept is the understanding or perception that individuals have of themselves, encompassing beliefs, attributes, and an awareness of one's own identity and personality traits.
Symbolic Interaction
A perspective in sociology that focuses on the ways in which individuals interpret and give meaning to symbols, objects, and actions in social contexts.
Attachment
The emotional bond that forms between individuals, or between individuals and objects, influencing their behavior and relationships.
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