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

Which of the following classes is one valid superclass of 'solubility of carbon atom in water'?

A. solubility of carbon atom in environmental material
B. (1->4)-beta-D-glucan
C. 17beta-hydroxy steroid
D. 1st arch mandibular mesenchyme from head mesenchyme

Answer: solubility of carbon atom in environmental material