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

After reasoning, which of the following classes is one valid superclass of 'benzil reductase [(S)-benzoin-forming] activity'?

A. catalytic activity
B. cell movement involved in somal translocation
C. maintenance of CRISPR repeat elements
D. obsolete N1-acetylspermine:oxygen oxidoreductase (propane-1,3-diamine-forming) activity

Answer: catalytic activity