Task: Inferred Class Relation Reasoning (ontology: Sciences/Biology)

After reasoning, which of the following classes is one valid superclass of '4-alpha-hydroxytetrahydrobiopterin dehydratase activity'?

A. obsolete negative regulation of histone H3-K4 methylation
B. catalytic activity
C. DNA replication termination
D. L-proline transmembrane transporter activity

Answer: catalytic activity