Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'future mouth'?

A. A proximal-distal subdivision of the digestive tract.
B. Common chamber into which the intestines and excretory system opens. Arises during development in all vertebrates, but in many it becomes subdivided, lost or incorporated into other structures.
C. The the concept region of the developing head.
D. Anterior part of the embryonic digestive tract that develops into a mouth. The the concept includes as parts an invagination of the ectoderm and the stomodeal cavity.

Answer: The the concept region of the developing head.