In the given excerpt, the motivations can be identified and classified as follows:
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External Motivation: Sarah's desire not to disappoint her parents is an external motivation. It is driven by her concern for her parents' expectations and the external pressure they represent regarding her performance in school.
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Internal Motivation: Although it is not explicitly mentioned in the excerpt, there could be an internal motivation present if Sarah also has a personal desire to achieve success or take pride in her work. However, the excerpt mainly highlights the external motivation related to her parents' expectations.
In summary, the primary motivation identified in this excerpt is external, linked to the expectations of her parents.