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

After reasoning, which of the following classes is one valid superclass of 'RNA guanylyltransferase activity'?

A. obsolete negative regulation of transcription from RNA polymerase II promoter in response to hydrogen peroxide
B. catalytic activity
C. epinephrine transport
D. mesonephric macula densa development

Answer: catalytic activity