Final answer:
The attorney admitted to the hospital is displaying behavior best described as (3) regression, which is a psychological defense mechanism characterized by a reversion to earlier developmental stages.
Step-by-step explanation:
The attorney admitted with epigastric pain and constantly calling the nurse with requests is most likely exhibiting a behavior known as regression. This is a defense mechanism where an individual reverts to a previous stage of psychological development.
It often occurs when people experience stress, allowing them to temporarily escape their adult responsibilities and return to a state in which they were cared for as a child. Regression can surface in various forms, such as increased dependency, passive behavior, or seeking more attention from caregivers, as seen in this case with the frequent calls to the nurse.