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

After reasoning, which of the following classes is one valid superclass of 'alpha-santalene synthase activity'?

A. catalytic activity
B. obsolete modulation of vasoactive intestinal polypeptide receptor activity in another organism
C. succinate-CoA ligase (GDP-forming) activity
D. regulation of GTPase activity

Answer: catalytic activity