Final answer:
The lobe of the brain associated with planning behavior and frequently linked with personality abnormalities when damaged is the frontal lobe, specifically the prefrontal cortex.
Step-by-step explanation:
Damage to which lobe of the brain, that normally plans appropriate behavior, has been most frequently associated with personality abnormalities? The correct answer to this question is B) Frontal.
The frontal lobe of the brain is responsible for various functions including motor skills, reasoning, problem solving, and parts of speech and language. The area of the frontal lobe associated with planning and moderating social behavior is the prefrontal cortex. Damage to the prefrontal cortex can lead to significant changes in personality and behavior, which has been documented in various cases, most famously that of Phineas Gage. Additionally, the practice of prefrontal lobotomy, which was once used to treat mental disorders, further highlights the importance of the frontal lobe in regulating personality.