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

Which of the following definitions best describes 'sedimentary intrusion'?

A. A dike formed when sediment fills a pre-existing fracture in a mass of rock.
B. A the concept is an igneous rock intrusion of irregular shape with a demonstrable base, absent in other types of irregularly-shaped intrusions.
C. A rock intrusion which is composed primarily of sedimentary rock.
D. A large igneous intrusion which is lenticular in shape with a depressed central region.

Answer: A rock intrusion which is composed primarily of sedimentary rock.