Which letter indicates the ester linkage in the following figure? 
Definitions:
Theoretically Diverse
Characterized by a wide range of theories or ideas in a particular field or subject, reflecting a broad spectrum of viewpoints.
Empirical Observations
Information gathered directly through the senses or instrumentation, forming the basis for scientific inquiry and evidence.
Psychology
The systematic exploration of human mind and its operations, particularly those influencing behavior in specific situations.
Applied Psychology
the branch of psychology focused on the practical application of research to solve real-world problems.
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