Four stages in the process of balancing glucose levels in the blood are highlighted by letters in the figure below. 
Which letter corresponds to the stage that is impacted by type 2 diabetes?
Definitions:
Developmental Theory
Developmental theory encompasses the various scientific perspectives and frameworks that seek to explain the changes in human capabilities, behavior, and understanding across the lifespan.
Survey
A method of gathering information from individuals, usually by asking a series of questions to collect data on various topics.
Comparison Group
A group in a study that does not receive the experimental treatment and is used as a benchmark to measure the effect of the treatment.
Cross-Sequential Design
A research design that combines both cross-sectional and longitudinal methods to study how individuals of different ages change over time.
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