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

After reasoning, which of the following classes is one valid superclass of 'beta-galactofuranosidase activity'?

A. proline catabolic process to 2-oxoglutarate
B. catalytic activity
C. obsolete modulation of mast cell degranulation in another organism
D. response to dsRNA

Answer: catalytic activity