Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'insect segmental subdivision of organ system'?

A. The part of some organism that is part of some specified segment.
B. The subdivision of the musculoskeletal system that consists of all the muscles of the body[VSAO, modified].
C. A set of midline structures surrounding the brainstem of the mammalian brain, originally described anatomically, e.g., hippocampal formation, amygdala, hypothalamus, cingulate cortex. Although the original designation was anatomical, the the concept has come to be associated with the system in the brain subserving emotional functions. As such, it is very poorly defined and doesn't correspond closely to the anatomical meaning any longer. [BirnLex].
D. Anatomical system that is a multi-element, multi-tissue anatomical cluster that consists of the skeleton and the articular system.

Answer: The part of some organism that is part of some specified segment.